| 3, 12, 30, 66, 138, 282, 570, 1146, 2298, 4602, 9210, 18426, 36858, 73722, 147450, 294906, 589818, 1179642, 2359290, 4718586, 9437178, 18874362, 37748730, 75497466, 150994938, 301989882, 603979770, 1207959546, 2415919098, 4831838202, 9663676410, 19327352826
(list; graph; listen)
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