A247216 - OEIS

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A247216 as a simple table

n	a(n)
1	3
2	13
3	31
4	55987
5	12207031
6	16148168401
7	50544702849929377
8	109912203092239643840221
9	11111111111111111111111
10	7369130657357778596659
11	568972471024107865287021434301977158534824481
12	388230138454493

[3,13,31,55987,12207031,16148168401, 50544702849929377,109912203092239643840221, 11111111111111111111111,7369130657357778596659, 568972471024107865287021434301977158534824481, 388230138454493]