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.

A229698 Number of defective 3-colorings of a 5 X n 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

Original entry on oeis.org

0, 2304, 62856, 1125333, 17724789, 258006388, 3583403667, 48115029568, 629879095575, 8082470014816, 102040738816275, 1270988929203520, 15651508367076687, 190863964416217648, 2307849686574725259
Offset: 1

Views

Author

R. H. Hardin, Sep 27 2013

Keywords

Comments

Row 5 of A229694.

Examples

			Some solutions for n=3:
  0 1 0   0 1 0   0 1 0   0 0 1   0 0 1   0 1 0   0 1 0
  2 1 2   2 1 0   2 0 1   1 0 2   1 0 2   2 2 1   2 1 0
  0 1 0   2 1 2   2 0 1   2 0 1   1 0 2   0 2 1   2 2 1
  2 0 1   1 2 0   2 1 2   1 0 2   1 0 1   1 0 2   1 0 1
  0 2 0   0 2 0   2 0 2   1 2 1   2 0 0   1 0 0   0 2 1
		

Formula

Empirical: a(n) = 48*a(n-1) - 960*a(n-2) + 10468*a(n-3) - 68685*a(n-4) + 282276*a(n-5) - 718624*a(n-6) + 997536*a(n-7) - 166467*a(n-8) - 2005784*a(n-9) + 3520224*a(n-10) - 1956780*a(n-11) - 1660207*a(n-12) + 3547332*a(n-13) - 2236608*a(n-14) - 28632*a(n-15) + 1014720*a(n-16) - 774528*a(n-17) + 307392*a(n-18) - 71424*a(n-19) + 9216*a(n-20) - 512*a(n-21) for n > 27.