A230712 - OEIS

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A230712 as a simple table

n	a(n)
1	1
2	12
3	107
4	840
5	5646
6	27755
7	124158
8	462961
9	961686
10	5589325
11	102654282
12	1025046359
13	8502347874
14	64101459205
15	356029844147
16	1681548425760
17	7005476875681
18	21848430755052
19	2978524660427
20	772649642011800

[1,12,107,840,5646,27755,124158,462961,961686, 5589325,102654282,1025046359,8502347874, 64101459205,356029844147,1681548425760, 7005476875681,21848430755052,2978524660427, 772649642011800]