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.

A301779 Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 32
3 240
4 1808
5 13616
6 102544
7 772272
8 5816080
9 43801648
10 329875856
11 2484337584
12 18709866512
13 140906415920
14 1061184377488
15 7991916306096
16 60188151652624
17 453284726792752
18 3413745694159760
19 25709358766289328
20 193620494140664336

List of values

[4, 32, 240, 1808, 13616, 102544, 772272, 5816080, 43801648, 329875856, 2484337584, 18709866512, 140906415920, 1061184377488, 7991916306096, 60188151652624, 453284726792752, 3413745694159760, 25709358766289328, 193620494140664336]

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

Content is available under The OEIS End-User License Agreement.