A221348 - OEIS

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A221348 as a simple table

n	a(n)
1	0
2	18
3	370
4	6893
5	122690
6	2152076
7	37541550
8	653557217
9	11369057766
10	197715942522
11	3438053202520
12	59781409121813
13	1039472974649122
14	18074147498877660
15	314268989617804842
16	5464430347020252629

[0,18,370,6893,122690,2152076,37541550,653557217, 11369057766,197715942522,3438053202520, 59781409121813,1039472974649122,18074147498877660, 314268989617804842,5464430347020252629]