| 1, 1, 6, 20, 69, 196, 554, 1368, 3240, 7110, 14896, 29624, 56755, 104468, 186484, 322800, 544590, 896259, 1443834, 2278640, 3531647, 5380064, 8069672, 11926928, 17392983, 25042836, 35637168, 50152068, 69853604, 96344440, 131669538
(list; graph; listen)
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