A091144 - OEIS

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A091144 as a simple table

n	a(n)
0	1
1	1
2	2
3	12
4	140
5	2530
6	62832
7	1997688
8	77652024
9	3573805950
10	190223180840
11	11502251937176
12	779092434772236
13	58448142042957576
14	4811642166029230560
15	431306008583779517040
16	41820546066482630185200

[1,1,2,12,140,2530,62832,1997688,77652024, 3573805950,190223180840,11502251937176, 779092434772236,58448142042957576, 4811642166029230560,431306008583779517040, 41820546066482630185200]