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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.

A209515 Number of (n+1) X 7 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases.

Table of values

n a(n)
1 598491
2 181445643
3 56515446141
4 17769569448759
5 5607670578249789
6 1772313933013227273
7 560493388203596285283
8 177302245070678360735145
9 56092636774113844825575603
10 17746700710940389030443863763

List of values

[598491, 181445643, 56515446141, 17769569448759, 5607670578249789, 1772313933013227273, 560493388203596285283, 177302245070678360735145, 56092636774113844825575603, 17746700710940389030443863763]

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

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