A198721 - OEIS

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A198721 as a simple table

n	a(n)
1	52
2	272410
3	5315840795
4	116492275674072
5	2572072097029554676
6	56817439251356046537693
7	1255145613308486512244031328
8	27727293796669883715931085888092
9	612520905593913038338760996059873808

[52,272410,5315840795,116492275674072, 2572072097029554676,56817439251356046537693, 1255145613308486512244031328, 27727293796669883715931085888092, 612520905593913038338760996059873808]