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.

A276244 Number of nX4 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,1) or (0,-2) and new values introduced in order 0..2.

Table of values

n a(n)
1 6
2 72
3 279
4 1447
5 7316
6 36744
7 188696
8 966555
9 4951790
10 25428687
11 130544436
12 670268288
13 3442454805
14 17679508687
15 90799294877
16 466351655607
17 2395200182414
18 12301874919271
19 63183522824553
20 324515866624876
21 1666740802461017

List of values

[6, 72, 279, 1447, 7316, 36744, 188696, 966555, 4951790, 25428687, 130544436, 670268288, 3442454805, 17679508687, 90799294877, 466351655607, 2395200182414, 12301874919271, 63183522824553, 324515866624876, 1666740802461017]

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

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