A122420 - OEIS

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A122420 as a simple table

n	a(n)
0	1
1	0
2	1
3	10
4	120
5	1778
6	31685
7	661940
8	15882128
9	430607370
10	13022755068
11	434697574538
12	15875944361864
13	629756003982336
14	26963278837704185
15	1239382820431888898
16	60875147436141987437
17	3181961834442383306068

[1,0,1,10,120,1778,31685,661940,15882128, 430607370,13022755068,434697574538,15875944361864, 629756003982336,26963278837704185, 1239382820431888898,60875147436141987437, 3181961834442383306068]