A278776 - OEIS

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A278776 as a simple table

n	a(n)
1	21
2	1750
3	48501
4	955347
5	16205001
6	251740932
7	3634987413
8	48847405083
9	611199661843
10	7140933364136
11	78280456105686
12	809842005695656
13	7953581118077240
14	74557744904209329
15	670158115881138987

[21,1750,48501,955347,16205001,251740932, 3634987413,48847405083,611199661843,7140933364136, 78280456105686,809842005695656,7953581118077240, 74557744904209329,670158115881138987]