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.

A303250 Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 2
2 45
3 203
4 1401
5 8664
6 55624
7 349273
8 2229806
9 14141138
10 89782352
11 570414504
12 3623364042
13 23013173083
14 146192778743
15 928659809148
16 5899066377892
17 37473134952091
18 238043423305307
19 1512137758273339
20 9605680030690948

List of values

[2, 45, 203, 1401, 8664, 55624, 349273, 2229806, 14141138, 89782352, 570414504, 3623364042, 23013173083, 146192778743, 928659809148, 5899066377892, 37473134952091, 238043423305307, 1512137758273339, 9605680030690948]

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

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