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A003091 [ 2^{n(n-1)/2} / n! ].
(Formerly M1870)
+0
1
1, 1, 1, 2, 8, 45, 416, 6657, 189372, 9695869, 902597327, 154043277297, 48535481831642, 28400190511772276, 31020581422991798557, 63530150754287203445810, 244912468225468597942626507, 1783398168624923337196441201196, 24605638395579573858211783276124626 (list; graph; listen)
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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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