A088894 - OEIS

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A088894 as a simple table

n	a(n)
1	0
2	1
3	656
4	64895
5	2263323
6	40728358
7	464160877
8	3788798018
9	23985732786
10	124343403711
11	548683300726
12	2120490369833
13	7334132330405
14	23085114905772
15	67009386720139
16	181293280189204
17	461148470725844

[0,1,656,64895,2263323,40728358,464160877, 3788798018,23985732786,124343403711,548683300726, 2120490369833,7334132330405,23085114905772, 67009386720139,181293280189204,461148470725844]