A202980 - OEIS

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A202980 as a simple table

n	a(n)
0	1
1	1
2	21
3	3581
4	4638641
5	48800828001
6	4323567045653269
7	3282556699972913697517
8	21588080014422603968890377825
9	1239061910207197852963732743864398913
10	624049391401084282980615178692488088532058133

[1,1,21,3581,4638641,48800828001,4323567045653269, 3282556699972913697517, 21588080014422603968890377825, 1239061910207197852963732743864398913, 624049391401084282980615178692488088532058133]