cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A193667 Triangular array: the fission of (p(n,x)) by (q(n,x)), where p(n,x)=(x+1)^n and q(n,x)=sum{F(k+1)*x^(n-k) : 0<=k<=n}, where F=A000045 (Fibonacci numbers).

Original entry on oeis.org

1, 1, 3, 1, 4, 8, 1, 5, 12, 21, 1, 6, 17, 33, 55, 1, 7, 23, 50, 88, 144, 1, 8, 30, 73, 138, 232, 377, 1, 9, 38, 103, 211, 370, 609, 987, 1, 10, 47, 141, 314, 581, 979, 1596, 2584, 1, 11, 57, 188, 455, 895, 1560, 2575, 4180, 6765, 1, 12, 68, 245, 643, 1350, 2455
Offset: 0

Views

Author

Clark Kimberling, Aug 11 2011

Keywords

Comments

See A193842 for the definition of the fission of P by Q, where P and Q are sequences of polynomials or triangular arrays (of coefficients of polynomials). A193667 is the mirror of A125172.

Examples

			First six rows:
1
1...3
1...4...8
1...5...12...21
1...6...17...33...55
1...7...23...50...88...144
		

Crossrefs

Programs

  • Mathematica
    z = 11;
    p[n_, x_] := (x + 1)^n;
    q[n_, x_] := Sum[Fibonacci[k + 1]*x^(n - k), {k, 0, n}];
    p1[n_, k_] := Coefficient[p[n, x], x^k];
    p1[n_, 0] := p[n, x] /. x -> 0;
    d[n_, x_] := Sum[p1[n, k]*q[n - 1 - k, x], {k, 0, n - 1}]
    h[n_] := CoefficientList[d[n, x], {x}]
    TableForm[Table[Reverse[h[n]], {n, 0, z}]]
    Flatten[Table[Reverse[h[n]], {n, -1, z}]]  (* A193667 *)
    TableForm[Table[h[n], {n, 0, z}]]
    Flatten[Table[h[n], {n, -1, z}]]  (* A125172 *)
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