A092381 - OEIS

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A092381 as a simple table

n	a(n)
18	1
19	1
20	47564380971
21	185410909790
22	5599434135148010392903
23	81562945655108319592717
24	2647122748975437613370942794822122
25	139318635878972598351963980703033608
26	6292966726927006717847495753884145618797281792

[1,1,47564380971,185410909790, 5599434135148010392903,81562945655108319592717, 2647122748975437613370942794822122, 139318635878972598351963980703033608, 6292966726927006717847495753884145618797281792]