A231110 - OEIS

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A231110 as a simple table

n	a(n)
1	0
2	0
3	42
4	438
5	4674
6	53530
7	616562
8	7084870
9	81402688
10	935286238
11	10746062272
12	123467810184
13	1418593781388
14	16299052416028
15	187269334301006
16	2151646785715718
17	24721526971823592
18	284040066485994938

[0,0,42,438,4674,53530,616562,7084870,81402688, 935286238,10746062272,123467810184,1418593781388, 16299052416028,187269334301006,2151646785715718, 24721526971823592,284040066485994938]