A270153 - OEIS

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A270153 as a simple table

n	a(n)
0	1
1	4
2	32
3	172
4	804
5	3209
6	13552
7	53700
8	217216
9	868181
10	3483608
11	13943208
12	55792533
13	223168792
14	892715048
15	3571004012

[1,4,32,172,804,3209,13552,53700,217216,868181, 3483608,13943208,55792533,223168792,892715048, 3571004012]