A179500 - OEIS

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A179500 as a simple table

n	a(n)
0	1
1	1
2	2
3	5
4	16
5	74
6	612
7	12271
8	893422
9	414194958
10	2790004382642
11	907459561737399050
12	79479770316224310083608800
13	22570656733849188237806831031463922346

[1,1,2,5,16,74,612,12271,893422,414194958, 2790004382642,907459561737399050, 79479770316224310083608800, 22570656733849188237806831031463922346]