A220635 - OEIS

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A220635 as a simple table

n	a(n)
1	1
2	1
3	8
4	114
5	1481
6	17527
7	201903
8	2329448
9	26904225
10	310837917
11	3591561452
12	41499180881
13	479508472309
14	5540546671074
15	64018957168901
16	739714921940047
17	8547125318062702
18	98758781455779205
19	1141120102778497151

[1,1,8,114,1481,17527,201903,2329448,26904225, 310837917,3591561452,41499180881,479508472309, 5540546671074,64018957168901,739714921940047, 8547125318062702,98758781455779205, 1141120102778497151]