A202800 - OEIS

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A202800 as a simple table

n	a(n)
1	21
2	1632
3	83518
4	4217066
5	217145076
6	11168045764
7	573985849362
8	29502860015392
9	1516477156642474
10	77948189988273490
11	4006599407114049916
12	205942439718841896456
13	10585607796890601624858
14	544108792600210068202950

[21,1632,83518,4217066,217145076,11168045764, 573985849362,29502860015392,1516477156642474, 77948189988273490,4006599407114049916, 205942439718841896456,10585607796890601624858, 544108792600210068202950]