List of period-2 oscillators with 18 cells

There are a total of 484 period-2 oscillators with 18 cells. Here are the 20 most common, and others of interest:

	Oscillator		apgcode	Frequency class	Cost in gliders
1		Great on-off	xp2_g8gid1e8z1226	22.4	5
2		Spark coil	xp2_rhewehr	24.0	4
3		1 beacon	xp2_ca9baiczw32	29.4	5
4		xp2_og2t1e8z6221	xp2_og2t1e8z6221	33.9	5
5		xp2_caabaiczw32	xp2_caabaiczw32	34.0	5
6		xp2_6a88baiczx32	xp2_6a88baiczx32	35.4	5
7		Racetrack and ortho-beacon	xp2_04aab96zc813	35.5	5
8		Cis-bipole on dock	xp2_31agozca22ac	35.6	5
9		Cis-beacon up on racetrack	xp2_0318cz69d552	36.0	7
10		xp2_og2t1acz6221	xp2_og2t1acz6221	36.2	8
11		Loaf on griddle	xp2_04a96z31d153	36.2	5
12		Cis-beacon down on racetrack	xp2_0318cz255d96	36.8	6
13		xp2_c8b8q4oz33x1	xp2_c8b8q4oz33x1	36.9	6
14		xp2_c813z39d1e8	xp2_c813z39d1e8	36.9	8
15		Trans-loaf test tube baby	xp2_0ggm952z344ko	37.2	6
16		Cis-beacon up on cis-loaf-with-long-leg	xp2_c813z319lic	37.7	7
17		xp2_caab9iczw32	xp2_caab9iczw32	37.8	8
18		Trans-bipole on dock	xp2_31agozwca22ac	38.3	9
19		Trans-beacon up on racetrack	xp2_069baa4zc813	38.3	8
20		xp2_253gv1og26	xp2_253gv1og26	38.6	8
N/A		Duodecapole	xp2_31a08zy01050k0gzy620ago	[No natural occurrences]	14

Other period-2 oscillator lists

• List of oscillators with 3 to 16 cells (complete; mostly but not all period 2)
• List of period-2 oscillators with 17 cells (will be complete but isn't yet)
• Larger period-2 oscillators (notable ones only)
• Oscillators with period 2 (category) (notable only but regardless of cell count)