Triangle read by rows: expansion of p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n+1)*Sum[Binomial[n-m, m]*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]].

A146774

Triangle read by rows: expansion of p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n+1)*Sum[Binomial[n-m, m]*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]].

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =18a(5) =1a(6) =1a(7) =35a(8) =35a(9) =1a(10) =1a(11) =100a(12) =70a(13) =100a(14) =1a(15) =1a(16) =261a(17) =202a(18) =202a(19) =261a(20) =1a(21) =1a(22) =646a(23) =783a(24) =276a(25) =783a(26) =646a(27) =1a(28) =1a(29) =1543

External references