A250833 - OEIS

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A250833 as a simple table

n	a(n)
1	55
2	4131
3	1301955
4	1751284191
5	10042099602523
6	245660147951906863
7	25646762400407469919163
8	11428578484306710530465058551

[55,4131,1301955,1751284191,10042099602523, 245660147951906863,25646762400407469919163, 11428578484306710530465058551]