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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A134061 Triangle read by rows: T(n,k) = A124928(n,k) + A134059(n,k) - A007318(n,k).

Original entry on oeis.org

1, 3, 5, 3, 10, 5, 3, 15, 15, 5, 3, 20, 30, 20, 5, 3, 25, 50, 50, 25, 5, 3, 30, 75, 100, 75, 30, 5, 3, 35, 105, 175, 175, 105, 35, 5, 3, 40, 140, 280, 350, 280, 140, 40, 5, 3, 45, 180, 420, 630, 630, 420, 180, 45, 5, 3, 50, 225, 600, 1050, 1260, 1050, 600, 225, 50, 5
Offset: 0

Views

Author

Gary W. Adamson, Oct 05 2007

Keywords

Comments

Row sums = A134062: (1, 8, 18, 38, 78, 158, ...).

Examples

			First few rows of the triangle:
  1;
  3,  5;
  3, 10,  5;
  3, 15, 15,  5;
  3, 20, 30, 20,  5;
  3, 25, 50, 50, 25,  5;
  ...
		

Crossrefs

Cf. A007318, A124928, A134059, A134062 (row sums).

Programs

  • Mathematica
    Table[If[k > 0, 3*Binomial[n, k], 1] + 2*Binomial[n, k] - 2*Boole[n == 0], {n, 0, 10}, {k, 0, n}] // Flatten (* Amiram Eldar, May 31 2025 *)

Formula

T(n,k) = 5*binomial(n,k) if k > 0, (0 <= k <= n), with leftmost column = (1,3,3,3,...).

Extensions

More terms from Amiram Eldar, May 31 2025
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