A002227 - OEIS

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A002227 as a simple table

n	a(n)
1	631
2	5531
3	72661
4	865957
5	2375059
6	32353609
7	175175603
8	945552637
9	945552637
10	54144188771
11	688203780167
12	2701344818803

[631,5531,72661,865957,2375059,32353609,175175603, 945552637,945552637,54144188771,688203780167, 2701344818803]