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

A146766

Triangle read by rows: expansion of p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n - 2)*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) =6a(5) =1a(6) =1a(7) =15a(8) =15a(9) =1a(10) =1a(11) =36a(12) =54a(13) =36a(14) =1a(15) =1a(16) =85a(17) =170a(18) =170a(19) =85a(20) =1a(21) =1a(22) =198a(23) =495a(24) =660a(25) =495a(26) =198a(27) =1a(28) =1a(29) =455

External references