A220568 - OEIS

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A220568 as a simple table

n	a(n)
1	1
2	610
3	27716
4	3128843
5	252139015
6	22926570957
7	1996515036228
8	176531479976571
9	15526120567015962
10	1368042952494285120
11	120466174602717968172
12	10610162775514570773634
13	934433508779628038701082

[1,610,27716,3128843,252139015,22926570957, 1996515036228,176531479976571,15526120567015962, 1368042952494285120,120466174602717968172, 10610162775514570773634,934433508779628038701082]