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1, 2, 3, 12, 20, 72, 168, 528, 1440, 4480, 13046, 40008, 120055, 366324, 1109745, 3380752, 10269819, 31253904, 95011267, 288979680, 878550498, 2671223720, 8120041693, 24682865208, 75020015675, 227999634772, 692872971246, 2105464666676
(list; graph; refs; listen; history; internal format)
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