A176380 - OEIS

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A176380 as a simple table

n	a(n)
1	1
2	3480
3	24220799
4	168576757560
5	1173294208396801
6	8166127521864977400
7	56836246378886034307199
8	395580266630919276913127640
9	2753238598914951788429334067201

[1,3480,24220799,168576757560,1173294208396801, 8166127521864977400,56836246378886034307199, 395580266630919276913127640, 2753238598914951788429334067201]