A247663 - OEIS

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A247663 as a simple table

n	a(n)
0	1
1	16
2	68
3	256
4	777
5	2160
6	5460
7	13056
8	29482
9	63952
10	133456
11	270080
12	531091
13	1019424
14	1913156
15	3520512
16	6360765
17	11305488
18	19789160
19	34159616
20	58201535

[1,16,68,256,777,2160,5460,13056,29482,63952, 133456,270080,531091,1019424,1913156,3520512, 6360765,11305488,19789160,34159616,58201535]