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.

A269085 Number of nX4 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 13
2 76
3 428
4 2238
5 11314
6 55620
7 268289
8 1274435
9 5982734
10 27813229
11 128268964
12 587560638
13 2675945006
14 12126527636
15 54715085702
16 245932380152
17 1101667424213
18 4920048498594
19 21913218006880
20 97358802936939
21 431593734805059

List of values

[13, 76, 428, 2238, 11314, 55620, 268289, 1274435, 5982734, 27813229, 128268964, 587560638, 2675945006, 12126527636, 54715085702, 245932380152, 1101667424213, 4920048498594, 21913218006880, 97358802936939, 431593734805059]

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

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