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.

A266133 Number of 3Xn integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors exactly one smaller than itself.

Table of values

n a(n)
1 1
2 20
3 77
4 117
5 278
6 1959
7 11044
8 36730
9 123887
10 598383
11 2919993
12 11429093
13 43919671
14 194434626
15 880889564
16 3627851352
17 14690154222
18 63196827262
19 276336307138
20 1159331148853
21 4807640087709
22 20468995961561
23 88006303609494

List of values

[1, 20, 77, 117, 278, 1959, 11044, 36730, 123887, 598383, 2919993, 11429093, 43919671, 194434626, 880889564, 3627851352, 14690154222, 63196827262, 276336307138, 1159331148853, 4807640087709, 20468995961561, 88006303609494]

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

Content is available under The OEIS End-User License Agreement.