Central quadrinomial coefficients.

A005721

Central quadrinomial coefficients.

Terms

    a(0) =1a(1) =4a(2) =44a(3) =580a(4) =8092a(5) =116304a(6) =1703636a(7) =25288120a(8) =379061020a(9) =5724954544a(10) =86981744944

External references