A140306 - OEIS

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A140306 as a simple table

n	a(n)
0	1
1	2
2	15
3	130
4	4852
5	456904
6	73948482
7	35616138799
8	43142990277818
9	115017363443317954
10	771239506285440035857

[1,2,15,130,4852,456904,73948482,35616138799, 43142990277818,115017363443317954, 771239506285440035857]