A220552 - OEIS

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A220552 as a simple table

n	a(n)
1	21
2	5536
3	940432
4	174911750
5	32001129185
6	5873481159019
7	1077372801893440
8	197644957649145164
9	36257360400073221806
10	6651328207323063530996
11	1220169722761405665767328
12	223837152224277574339972896

[21,5536,940432,174911750,32001129185, 5873481159019,1077372801893440,197644957649145164, 36257360400073221806,6651328207323063530996, 1220169722761405665767328, 223837152224277574339972896]