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.

A266020 Number of nX3 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.

Table of values

n a(n)
1 4
2 14
3 33
4 91
5 316
6 1045
7 3394
8 11102
9 36842
10 122052
11 402200
12 1324463
13 4373322
14 14443892
15 47671729
16 157325046
17 519327402
18 1714258173
19 5658200079
20 18676187387
21 61646837018
22 203484164638
23 671655360694
24 2216987948652
25 7317807541625

List of values

[4, 14, 33, 91, 316, 1045, 3394, 11102, 36842, 122052, 402200, 1324463, 4373322, 14443892, 47671729, 157325046, 519327402, 1714258173, 5658200079, 18676187387, 61646837018, 203484164638, 671655360694, 2216987948652, 7317807541625]

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

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