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.

A302423 Number of nX4 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 5
2 17
3 21
4 42
5 148
6 362
7 879
8 2447
9 6306
10 15905
11 42221
12 110418
13 283913
14 742439
15 1940186
16 5029913
17 13102975
18 34178122
19 88873888
20 231355589
21 602826384
22 1569061436
23 4084569987
24 10637783556
25 27695951899
26 72104297278
27 187752963431

List of values

[5, 17, 21, 42, 148, 362, 879, 2447, 6306, 15905, 42221, 110418, 283913, 742439, 1940186, 5029913, 13102975, 34178122, 88873888, 231355589, 602826384, 1569061436, 4084569987, 10637783556, 27695951899, 72104297278, 187752963431]

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

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