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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A234354 Number of non-equivalent (mod D_3) ways to arrange 6 indistinguishable points on a triangular grid of side n so that no three points are collinear.

Original entry on oeis.org

1, 47, 1112, 11743, 82988, 433372, 1820163, 6459496, 20287372, 57129426, 147915285, 356109110, 804785159, 1722171831
Offset: 4

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Author

Heinrich Ludwig, Dec 30 2013

Keywords

Comments

Column 6 of triangle A234350.
Without the restriction "non-equivalent (mod D_3)" the numbers are given by A194134.

Examples

			There is a(4) = 1 non-equivalent way to arrange 6 indistinguishable points (x) on a triangular grid of side 4:
     .
    x x
   x . x
  . x x .

Crossrefs

Cf. A234350, A194134
Arranging 3 points: A234351
Arranging 4 points: A234352
Arranging 5 points: A234353

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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