A109366 - OEIS

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A109366 as a simple table

n	a(n)
0	1
1	2
2	9
3	55
4	448
5	5533
6	77753
7	1415862
8	28378685
9	685274581
10	20695944714
11	662817798145
12	25290008485783
13	1064065877641048
14	46842303103453733
15	2251599342111454707
16	121817407196390147320
17	7320071385771594519593

[1,2,9,55,448,5533,77753,1415862,28378685, 685274581,20695944714,662817798145,25290008485783, 1064065877641048,46842303103453733, 2251599342111454707,121817407196390147320, 7320071385771594519593]