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

A146765

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =10a(5) =1a(6) =1a(7) =27a(8) =27a(9) =1a(10) =1a(11) =68a(12) =102a(13) =68a(14) =1a(15) =1a(16) =165a(17) =330a(18) =330a(19) =165a(20) =1a(21) =1a(22) =390a(23) =975a(24) =1300a(25) =975a(26) =390a(27) =1a(28) =1a(29) =903

External references