Fourth column of PE^4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =16a(5) =200a(6) =2320a(7) =26460a(8) =303968a(9) =3557904a(10) =42676320a(11) =526076100a(12) =6673368240a(13) =87148818328