A268282 - OEIS

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A268282 as a simple table

n	a(n)
0	1
1	4
2	32
3	176
4	844
5	3432
6	14248
7	57532
8	231408
9	926044
10	3692696
11	14741340
12	58895984
13	235366568
14	940894304
15	3762128704

[1,4,32,176,844,3432,14248,57532,231408,926044, 3692696,14741340,58895984,235366568,940894304, 3762128704]