A216614 - OEIS

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A216614 as a simple table

n	a(n)
1	2
2	15
3	67
4	4140
5	83437
6	18171918
7	732209051
8	346212390266
9	22294303538804
10	18633407258171930
11	1714659308610029464

[2,15,67,4140,83437,18171918,732209051, 346212390266,22294303538804,18633407258171930, 1714659308610029464]