Central quadrinomial coefficients: largest coefficient of (1 + x + x^2 + x^3)^n.

A005190

Central quadrinomial coefficients: largest coefficient of (1 + x + x^2 + x^3)^n.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =12a(4) =44a(5) =155a(6) =580a(7) =2128a(8) =8092a(9) =30276a(10) =116304a(11) =440484a(12) =1703636a(13) =6506786a(14) =25288120a(15) =97181760a(16) =379061020a(17) =1463609356a(18) =5724954544a(19) =22187304112a(20) =86981744944a(21) =338118529539

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