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.

A267023 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo 4 and the upper left element equal to 0.

Table of values

n a(n)
1 6
2 8
3 21
4 137
5 759
6 4835
7 31591
8 216460
9 1516047
10 10864196
11 79437844
12 590119523
13 4453596825
14 34028591249
15 263304258843
16 2058154419091
17 16252842542358
18 129434331448080
19 1039407597863960
20 8405943746368118
21 68447035142972923

List of values

[6, 8, 21, 137, 759, 4835, 31591, 216460, 1516047, 10864196, 79437844, 590119523, 4453596825, 34028591249, 263304258843, 2058154419091, 16252842542358, 129434331448080, 1039407597863960, 8405943746368118, 68447035142972923]

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

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