A250465 - OEIS

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A250465 as a simple table

n	a(n)
1	637
2	9651
3	135753
4	1920345
5	27076065
6	381830463
7	5383012776
8	75892576784
9	1069934356217
10	15084094478445
11	212656648654313
12	2998054563599503
13	42266832073393269
14	595881668315011177
15	8400792923303457876

[637,9651,135753,1920345,27076065,381830463, 5383012776,75892576784,1069934356217, 15084094478445,212656648654313,2998054563599503, 42266832073393269,595881668315011177, 8400792923303457876]