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.

A280065 Number of nX4 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Table of values

n a(n)
1 2
2 4
3 15
4 52
5 170
6 603
7 2157
8 7777
9 28195
10 102429
11 372430
12 1355019
13 4930977
14 17946466
15 65320396
16 237756751
17 865411414
18 3150039989
19 11465974491
20 41735611962
21 151915810407
22 552967220870
23 2012778077066
24 7326430841669

List of values

[2, 4, 15, 52, 170, 603, 2157, 7777, 28195, 102429, 372430, 1355019, 4930977, 17946466, 65320396, 237756751, 865411414, 3150039989, 11465974491, 41735611962, 151915810407, 552967220870, 2012778077066, 7326430841669]

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

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