a(n) = n!*Pell(n) (or n!*A000129(n)).

A052631

a(n) = n!*Pell(n) (or n!*A000129(n)).

Terms

    a(0) =0a(1) =1a(2) =4a(3) =30a(4) =288a(5) =3480a(6) =50400a(7) =851760a(8) =16450560a(9) =357436800a(10) =8629286400a(11) =229162348800

External references