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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A234352 Number of non-equivalent (mod D_3) ways to arrange 4 indistinguishable points on a triangular grid of side n so that no three points are collinear.

Original entry on oeis.org

2, 24, 153, 713, 2557, 7661, 20055, 47153, 101821, 205322, 390580, 707708, 1229969, 2060777, 3344487
Offset: 3

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Author

Heinrich Ludwig, Dec 30 2013

Keywords

Comments

Column 4 of triangle A234350.
Without the restriction "non-equivalent (mod D_3)" the numbers are given by A194132.

Examples

			There are a(3) = 2 non-equivalent ways to arrange 4 indistinguishable points (x) on a triangular grid of side 3:
    x         .
   x x       x x
  . x .     x . x

Crossrefs

Cf. A234350, A194132
Arranging 3 points: A234351
Arranging 5 points: A234353
Arranging 6 points: A234354

Extensions

a(14)-a(17) from Heinrich Ludwig, Apr 19 2016
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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