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.

A269277 Number of 2 X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 0
2 108
3 1368
4 13896
5 127512
6 1104264
7 9211608
8 74853576
9 596581272
10 4684312584
11 36347893848
12 279339197256
13 2129701963032
14 16128206816904
15 121439499248088
16 909870855444936
17 6787656513072792
18 50443519266217224
19 373614100586474328

List of values

[0, 108, 1368, 13896, 127512, 1104264, 9211608, 74853576, 596581272, 4684312584, 36347893848, 279339197256, 2129701963032, 16128206816904, 121439499248088, 909870855444936, 6787656513072792, 50443519266217224, 373614100586474328]

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

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