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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A131247 2*A052509 - A000012.

Original entry on oeis.org

1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 1, 7, 7, 3, 1, 1, 9, 13, 7, 3, 1, 1, 11, 21, 15, 7, 3, 1, 1, 13, 31, 29, 15, 7, 3, 1, 1, 15, 43, 51, 31, 15, 7, 3, 1, 1, 17, 57, 83, 61, 31, 15, 7, 3, 1
Offset: 0

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Author

Gary W. Adamson, Jun 23 2007

Keywords

Comments

Row sums = A104161 starting (1, 2, 5, 10, 19, 34, 59, ...). Reversal, A131248 is generated from 2*A004070 - A000012.

Examples

			First few rows of the triangle:
  1;
  1,  1;
  1,  3,  1;
  1,  5,  3,  1;
  1,  7,  7,  3,  1;
  1,  9, 13,  7,  3,  1;
  1, 11, 21, 15,  7,  3,  1;
  ...

Crossrefs

Cf. A052509, A104161, A004070, A131248.

Formula

2*A052509 - A000012, where A000012 = (1; 1,1; 1,1,1; ...).
Showing 1-1 of 1 results.

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