A071787 - OEIS

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A071787 as a simple table

n	a(n)
1	1
2	1
3	1
4	2
5	5
6	12
7	47
8	120
9	12917
10	33840
11	329458703
12	874222560
13	4526064144016687091
14	12096849691539466560
15	4339254722819592663241773932837977109

[1,1,1,2,5,12,47,120,12917,33840,329458703, 874222560,4526064144016687091, 12096849691539466560, 4339254722819592663241773932837977109]