Second column of PE^4.

Terms

a(0) =0a(1) =1a(2) =8a(3) =60a(4) =464a(5) =3780a(6) =32568a(7) =296492a(8) =2845088a(9) =28695060a(10) =303334920a(11) =3351877628a(12) =38622668400a(13) =463036981732