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

A146773

Triangle read by rows: expansion of p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n)*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) =10a(5) =1a(6) =1a(7) =19a(8) =19a(9) =1a(10) =1a(11) =52a(12) =38a(13) =52a(14) =1a(15) =1a(16) =133a(17) =106a(18) =106a(19) =133a(20) =1a(21) =1a(22) =326a(23) =399a(24) =148a(25) =399a(26) =326a(27) =1a(28) =1a(29) =775

External references