A146201 - OEIS

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A146201 as a simple table

n	a(n)
2	0
3	12
4	1640
5	23650
6	129116
7	457330
8	1265468
9	2979098
10	6251260
11	12030146
12	21635420
13	36843178
14	59979548
15	94022930
16	142714876
17	210679610
18	303552188
19	428115298
20	592444700
21	806063306

[0,12,1640,23650,129116,457330,1265468,2979098, 6251260,12030146,21635420,36843178,59979548, 94022930,142714876,210679610,303552188,428115298, 592444700,806063306]