login

A220808 as a simple table

na(n)
18
2168
33466
462400
51037774
616734366
7268264812
84294285044
968716748256
101099500713960
1117592142389240
12281474802089984
134503598928887808
1472057591243997184
151152921493431123968
1618446744029006659584

[8,168,3466,62400,1037774,16734366,268264812,
 4294285044,68716748256,1099500713960,
 17592142389240,281474802089984,4503598928887808,
 72057591243997184,1152921493431123968,
 18446744029006659584]