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A001499 as a simple table

n a(n)
0 1
1 0
2 1
3 6
4 90
5 2040
6 67950
7 3110940
8 187530840
9 14398171200
10 1371785398200
11 158815387962000
12 21959547410077200
13 3574340599104475200
14 676508133623135814000
15 147320988741542099484000
16 36574751938491748341360000
17 10268902998771351157327104000

[1,0,1,6,90,2040,67950,3110940,187530840,
 14398171200,1371785398200,158815387962000,
 21959547410077200,3574340599104475200,
 676508133623135814000,147320988741542099484000,
 36574751938491748341360000,
 10268902998771351157327104000]

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Last modified August 24 02:32 EDT 2017. Contains 291052 sequences.