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.

A302809 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 32
3 169
4 934
5 5117
6 28128
7 154494
8 848519
9 4660562
10 25597855
11 140595667
12 772217905
13 4241385457
14 23295695745
15 127950975583
16 702767266506
17 3859930159709
18 21200561758854
19 116443510741144
20 639562826045595

List of values

[4, 32, 169, 934, 5117, 28128, 154494, 848519, 4660562, 25597855, 140595667, 772217905, 4241385457, 23295695745, 127950975583, 702767266506, 3859930159709, 21200561758854, 116443510741144, 639562826045595]

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

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