A264575 - OEIS

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A264575 as a simple table

n	a(n)
1	4
2	64
3	646
4	18540
5	403872
6	13182464
7	298587595
8	8004883334
9	207395987160
10	5415371441696
11	139437679992950
12	3610605830997732
13	93761760429319800
14	2424276830794155853
15	62680901817510938800
16	1621243139189452222421

[4,64,646,18540,403872,13182464,298587595, 8004883334,207395987160,5415371441696, 139437679992950,3610605830997732, 93761760429319800,2424276830794155853, 62680901817510938800,1621243139189452222421]