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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.

A208347 Number of nX2 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).

Table of values

n a(n)
1 2
2 15
3 100
4 868
5 7780
6 69988
7 629860
8 5668708
9 51018340
10 459165028
11 4132485220
12 37192366948
13 334731302500
14 3012581722468
15 27113235502180
16 244019119519588
17 2196172075676260
18 19765548681086308
19 177889938129776740

List of values

[2, 15, 100, 868, 7780, 69988, 629860, 5668708, 51018340, 459165028, 4132485220, 37192366948, 334731302500, 3012581722468, 27113235502180, 244019119519588, 2196172075676260, 19765548681086308, 177889938129776740]

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

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