A015473 - OEIS

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A015473 as a simple table

n	a(n)
0	0
1	1
2	2
3	9
4	74
5	1193
6	38250
7	2449193
8	313534954
9	80267397417
10	41097221012458
11	42083634584154409
12	86187324725569242090
13	353023324159566199755049
14	2891967157702491033962603498
15	47381990264820937260009495466281

[0,1,2,9,74,1193,38250,2449193,313534954, 80267397417,41097221012458,42083634584154409, 86187324725569242090,353023324159566199755049, 2891967157702491033962603498, 47381990264820937260009495466281]