A297312 - OEIS

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A297312 as a simple table

n	a(n)
1	21
2	654
3	13937
4	340825
5	8273245
6	200646607
7	4869858862
8	118156684121
9	2867120332406
10	69570025944705
11	1688108287602302
12	40961748924233513
13	993931518658886393
14	24117625902266425892
15	585211158099440381626

[21,654,13937,340825,8273245,200646607,4869858862, 118156684121,2867120332406,69570025944705, 1688108287602302,40961748924233513, 993931518658886393,24117625902266425892, 585211158099440381626]