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A115462 as a simple table

na(n)
01
139
228704
31742232560
425015702424562603
5261673815513000717140575872
65986257591270542940940766674496702426288
7898505149957215365756286256207383540787286531952289973040

[1,39,28704,1742232560,25015702424562603,
 261673815513000717140575872,
 5986257591270542940940766674496702426288,
 89850514995721536575628625620738354078728653195228\
 9973040]