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A251666 as a simple table

na(n)
01
15
274
32028
483352
54607496
6321156000
727064420704
82677510124928
9304299947999232
1039075730095810816
115595805388119057920
12884245579070535235584
13152843879008651568329728
1428688663318934190485491712
155811091829207760774331662336
161263471121829937070180445552640

[1,5,74,2028,83352,4607496,321156000,27064420704,
 2677510124928,304299947999232,39075730095810816,
 5595805388119057920,884245579070535235584,
 152843879008651568329728,
 28688663318934190485491712,
 5811091829207760774331662336,
 1263471121829937070180445552640]