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.

A268770 Number of n X 4 0..2 arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

Table of values

n a(n)
1 36
2 100
3 446
4 2296
5 10340
6 46312
7 198114
8 837848
9 3472210
10 14245712
11 57796288
12 232692368
13 930069146
14 3696103032
15 14612457534
16 57516087912
17 225502135332
18 881077245816
19 3431904293122
20 13330760323672
21 51652205043266

List of values

[36, 100, 446, 2296, 10340, 46312, 198114, 837848, 3472210, 14245712, 57796288, 232692368, 930069146, 3696103032, 14612457534, 57516087912, 225502135332, 881077245816, 3431904293122, 13330760323672, 51652205043266]

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

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