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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A128137 A002260 * A128132.

Original entry on oeis.org

1, -1, 4, -1, 1, 9, -1, 1, 5, 16, -1, 1, 5, 11, 25, -1, 1, 5, 11, 19, 36, -1, 1, 5, 11, 19, 29, 49, -1, 1, 5, 11, 19, 29, 41, 64, -1, 1, 5, 11, 19, 29, 41, 55, 81, -1, 1, 5, 11, 19, 29, 41, 55, 71, 100
Offset: 1

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Author

Gary W. Adamson, Feb 16 2007

Keywords

Comments

Deleting the right and left borders gives terms of A028387: (1, 5, 11, 29, 29, 41, 55, 71, ...). Row sums = A064999: (1, 3, 9, 21, 41, ...).

Examples

			First few rows of the triangle:
   1;
  -1, 4;
  -1, 1, 9;
  -1, 1, 5, 16;
  -1, 1, 5, 11, 25;
  -1, 1, 5, 11, 19, 36;
  -1, 1, 5, 11, 19, 29, 49;
  ...

Crossrefs

Cf. A002260, A128132, A028387, A128136, A064999.

Formula

A002260 * A128132 as infinite lower triangular matrices.
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