A267630 - OEIS

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A267630 as a simple table

n	a(n)
1	6
2	27
3	208
4	2386
5	32208
6	445970
7	6039160
8	80742586
9	1086798652
10	14898269746
11	208430268352
12	2964609577834
13	42639468240764
14	617605254789776
15	8990677585470960
16	131473208822453124
17	1931423573382740480

[6,27,208,2386,32208,445970,6039160,80742586, 1086798652,14898269746,208430268352,2964609577834, 42639468240764,617605254789776,8990677585470960, 131473208822453124,1931423573382740480]