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.

A253290 Number of (n+1)X(2+1) 0..2 arrays with every 2X2 subblock sum differing from its neighbors horizontally, vertically, diagonally and antidiagonally.

Table of values

n a(n)
1 558
2 3600
3 23546
4 167832
5 1184928
6 8243488
7 57474376
8 402165016
9 2811886280
10 19648735840
11 137308874176
12 959744819720
13 6708131042848
14 46884212361800
15 327678437410752
16 2290232105294136
17 16007076725008072
18 111877100758327680

List of values

[558, 3600, 23546, 167832, 1184928, 8243488, 57474376, 402165016, 2811886280, 19648735840, 137308874176, 959744819720, 6708131042848, 46884212361800, 327678437410752, 2290232105294136, 16007076725008072, 111877100758327680]

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

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