a(n) = (4*n+10)(!^4)/10(!^4), related to A000407 ((4*n+2)(!^4) quartic, or 4-factorials).

A051622

a(n) = (4*n+10)(!^4)/10(!^4), related to A000407 ((4*n+2)(!^4) quartic, or 4-factorials).

Terms

    a(0) =1a(1) =14a(2) =252a(3) =5544a(4) =144144a(5) =4324320a(6) =147026880a(7) =5587021440a(8) =234654900480

External references