A135032 - OEIS

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A135032 as a simple table

n	a(n)
0	0
1	1
2	6
3	40
4	264
5	1744
6	11520
7	76096
8	502656
9	3320320
10	21932544
11	144876544
12	956989440
13	6321442816
14	41756614656
15	275825459200
16	1821979213824
17	12035177119744
18	79498979573760
19	525134585921536
20	3468803433824256

[0,1,6,40,264,1744,11520,76096,502656,3320320, 21932544,144876544,956989440,6321442816, 41756614656,275825459200,1821979213824, 12035177119744,79498979573760,525134585921536, 3468803433824256]