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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A131241 3*A046854 - 2*I.

Original entry on oeis.org

1, 3, 1, 3, 3, 1, 3, 6, 3, 1, 3, 6, 9, 3, 1, 3, 9, 9, 12, 3, 1, 3, 9, 18, 12, 15, 3, 1, 3, 12, 18, 30, 15, 18, 3, 1, 3, 12, 30, 30, 45, 18, 21, 3, 1, 3, 15, 30, 60, 45, 63, 21, 24, 3, 1
Offset: 0

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Author

Gary W. Adamson, Jun 21 2007

Keywords

Comments

Row sums = A111314: (1, 4, 7, 13, 22, 37, ...). A131240 = 2*A046854 - I.

Examples

			First few rows of the triangle:
  1;
  3,  1;
  3,  3,  1;
  3,  6,  3,  1;
  3,  6,  9,  3,  1;
  3,  9,  9, 12,  3,  1
  3,  9, 18, 12, 15,  3,  1;
  ...

Crossrefs

Cf. A046854, A111314, A131240.

Formula

3*A046854 - 2*I, where A046854 = Pascal's triangle with repeats by columns and I = Identity matrix.
Showing 1-1 of 1 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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