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A002494 as a simple table

n a(n)
0 1
1 0
2 1
3 2
4 7
5 23
6 122
7 888
8 11302
9 262322
10 11730500
11 1006992696
12 164072174728
13 50336940195360
14 29003653625867536
15 31397431814147073280
16 63969589218557753586160
17 245871863137828405125824848

[1,0,1,2,7,23,122,888,11302,262322,11730500,
 1006992696,164072174728,50336940195360,
 29003653625867536,31397431814147073280,
 63969589218557753586160,
 245871863137828405125824848]

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Last modified January 18 18:56 EST 2018. Contains 297864 sequences.