A136519 - OEIS

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A136519 as a simple table

n	a(n)
0	1
1	3
2	15
3	156
4	4556
5	417384
6	128004240
7	136874853504
8	523288667468832
9	7257782720507161152
10	368292386875012729754240
11	68761030015590030510485191680
12	47447175348985315294381264871833600

[1,3,15,156,4556,417384,128004240,136874853504, 523288667468832,7257782720507161152, 368292386875012729754240, 68761030015590030510485191680, 47447175348985315294381264871833600]