A267242 - OEIS

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A267242 as a simple table

n	a(n)
1	6
2	34
3	232
4	1986
5	20040
6	220235
7	2499080
8	28501471
9	323067002
10	3626695952
11	40306404192
12	443852375808
13	4848323701804
14	52590398731297
15	567018802063680
16	6081537709403509
17	64929807220896558
18	690446673537426382

[6,34,232,1986,20040,220235,2499080,28501471, 323067002,3626695952,40306404192,443852375808, 4848323701804,52590398731297,567018802063680, 6081537709403509,64929807220896558, 690446673537426382]