A000856 - OEIS

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A000856 as a simple table

n	a(n)
1	3
2	24
3	1676
4	22920064
5	19218307944059712
6	59076800018995725211209511239630848
7	2871827610052485008814239127114787142200471197616427462842969283498868736

[3,24,1676,22920064,19218307944059712, 59076800018995725211209511239630848, 28718276100524850088142391271147871422004711976164\ 27462842969283498868736]