A337955 - OEIS

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A337955 as a simple table

n	a(n)
1	1
2	308
3	34128
4	1056576
5	15303750
6	136236276
7	865711763
8	4296782848
9	17656466751
10	62510672500
11	196174554026
12	557301826368
13	1456216515468
14	3543525156276
15	8109415963125
16	17592637669376
17	36414622551373

[1,308,34128,1056576,15303750,136236276,865711763, 4296782848,17656466751,62510672500,196174554026, 557301826368,1456216515468,3543525156276, 8109415963125,17592637669376,36414622551373]