A308596 - OEIS

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A308596 as a simple table

n	a(n)
1	15
2	70
3	6006
4	1385670
5	674612557710
6	1006366256282310
7	6899316550553351234310
8	29365306848773629524600810
9	1033423560710676120463066852232970
10	1090001884152331303039489872122195258388782310

[15,70,6006,1385670,674612557710,1006366256282310, 6899316550553351234310,29365306848773629524600810, 1033423560710676120463066852232970, 1090001884152331303039489872122195258388782310]