A223763 - OEIS

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A223763 as a simple table

n	a(n)
1	2
2	12
3	71
4	361
5	1748
6	8007
7	35513
8	153450
9	651075
10	2723829
11	11275932
12	46302339
13	188958191
14	767474182
15	3105857015

[2,12,71,361,1748,8007,35513,153450,651075, 2723829,11275932,46302339,188958191,767474182, 3105857015]