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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.

A223507 Petersen graph (3,1) coloring a rectangular array: number of 4Xn 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,3 3,5 3,4 1,2 1,4 4,5 2,0 2,5 and every array movement to a horizontal, diagonal or antidiagonal neighbor moves along an edge of this graph, with the array starting at 0.

Table of values

n a(n)
1 216
2 771
3 20115
4 426359
5 9685063
6 216562815
7 4867038759
8 109246101385
9 2453094910375
10 55078160026621
11 1236680655855829
12 27767207466078683
13 623458974380912329
14 13998557054872762899
15 314310396038821269603

List of values

[216, 771, 20115, 426359, 9685063, 216562815, 4867038759, 109246101385, 2453094910375, 55078160026621, 1236680655855829, 27767207466078683, 623458974380912329, 13998557054872762899, 314310396038821269603]

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

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