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.

A303239 Number of nX5 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 34
3 60
4 255
5 1106
6 5158
7 23995
8 108726
9 506416
10 2400455
11 11206914
12 52620426
13 248789167
14 1172758534
15 5532271468
16 26154017151
17 123634836850
18 584566350050
19 2765874355363
20 13089996381214
21 61961733243948
22 293379713085303

List of values

[1, 34, 60, 255, 1106, 5158, 23995, 108726, 506416, 2400455, 11206914, 52620426, 248789167, 1172758534, 5532271468, 26154017151, 123634836850, 584566350050, 2765874355363, 13089996381214, 61961733243948, 293379713085303]

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

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