login

A027505 as a simple table

na(n)
215
3609
41920
5392486
6113377876875
7155741745023280000
86605216052044829651068
962870654640959433925847207524
1021721105002949781819252278922169473422080

[15,609,1920,392486,113377876875,
 155741745023280000,6605216052044829651068,
 62870654640959433925847207524,
 21721105002949781819252278922169473422080]