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.

A302872 Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 3
2 11
3 17
4 37
5 82
6 209
7 536
8 1549
9 4513
10 13980
11 44424
12 142457
13 463592
14 1518144
15 4985864
16 16423493
17 54170895
18 178797985
19 590488247
20 1950654770
21 6444889749
22 21296082916
23 70373480203
24 232558689443
25 768538881502
26 2539828012418

List of values

[3, 11, 17, 37, 82, 209, 536, 1549, 4513, 13980, 44424, 142457, 463592, 1518144, 4985864, 16423493, 54170895, 178797985, 590488247, 1950654770, 6444889749, 21296082916, 70373480203, 232558689443, 768538881502, 2539828012418]

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

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