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.

A268777 Number of n X 4 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once.

Table of values

n a(n)
1 13
2 65
3 316
4 1462
5 6383
6 27531
7 115391
8 478849
9 1957904
10 7940136
11 31916445
12 127480373
13 506131101
14 1999695453
15 7865869056
16 30823236470
17 120372357259
18 468663337303
19 1819741296607
20 7048393305965
21 27239539562644
22 105056982554032

List of values

[13, 65, 316, 1462, 6383, 27531, 115391, 478849, 1957904, 7940136, 31916445, 127480373, 506131101, 1999695453, 7865869056, 30823236470, 120372357259, 468663337303, 1819741296607, 7048393305965, 27239539562644, 105056982554032]

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

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