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A086720 as a simple table

na(n)
01
15
229
34679
4115004
540990
6109649679500
743576504
812773032712224
9652563537985839568
10637968792992
118571374386402604320
12436474868374689040256
13876434343149295070804288
1435599183060918735547373871744
15812962598599768399506819343144448
1611292695814902576267980257280

[1,5,29,4679,115004,40990,109649679500,43576504,
 12773032712224,652563537985839568,637968792992,
 8571374386402604320,436474868374689040256,
 876434343149295070804288,
 35599183060918735547373871744,
 812962598599768399506819343144448,
 11292695814902576267980257280]