A221732 - OEIS

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A221732 as a simple table

n	a(n)
1	8
2	152
3	2904
4	54888
5	1038128
6	19634240
7	371344456
8	7023277960
9	132832016296
10	2512266303304
11	47514764548512
12	898651885401840
13	16996300388100616
14	321452869097777272
15	6079672910672787704
16	114985511887049164712

[8,152,2904,54888,1038128,19634240,371344456, 7023277960,132832016296,2512266303304, 47514764548512,898651885401840,16996300388100616, 321452869097777272,6079672910672787704, 114985511887049164712]