A152401 - OEIS

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A152401 as a simple table

n	a(n)
0	1
1	2
2	8
3	45
4	318
5	2671
6	25805
7	280609
8	3381993
9	44658052
10	640279918
11	9895457035
12	163871617543
13	2893296199441
14	54230087607409
15	1075060346670798
16	22467666780553040
17	493590689966427930
18	11369641989418301977

[1,2,8,45,318,2671,25805,280609,3381993,44658052, 640279918,9895457035,163871617543,2893296199441, 54230087607409,1075060346670798,22467666780553040, 493590689966427930,11369641989418301977]