Form array in which n-th row is obtained by expanding (1+x+x^2)^n and taking the 5th column from the center.

A098470

Form array in which n-th row is obtained by expanding (1+x+x^2)^n and taking the 5th column from the center.

Terms

    a(0) =1a(1) =6a(2) =28a(3) =112a(4) =414a(5) =1452a(6) =4917a(7) =16236a(8) =52624a(9) =168168a(10) =531531a(11) =1665456a(12) =5182008a(13) =16031952a(14) =49366674a(15) =151419816a(16) =462919401a(17) =1411306358a(18) =4292487562a(19) =13029127584a(20) =39478598170a(21) =119439969220a(22) =360881425710

External references