A219379 - OEIS

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A219379 as a simple table

n	a(n)
1	21
2	66
3	2792
4	60738
5	1307685
6	23986853
7	409150493
8	6702007395
9	105240489608
10	1564398481928
11	21973021284822
12	293178712037844

[21,66,2792,60738,1307685,23986853,409150493, 6702007395,105240489608,1564398481928, 21973021284822,293178712037844]