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.

A183813 1/81 the number of (n+1) X 3 0..2 arrays with no 2 X 2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

Table of values

n a(n)
1 8
2 162
3 3256
4 65640
5 1321860
6 26630220
7 536415300
8 10805642100
9 217666494900
10 4384657426500
11 88323978892500
12 1779188631250500
13 35839769985112500
14 721952272492222500
15 14542924237284172500
16 292951012163242162500

List of values

[8, 162, 3256, 65640, 1321860, 26630220, 536415300, 10805642100, 217666494900, 4384657426500, 88323978892500, 1779188631250500, 35839769985112500, 721952272492222500, 14542924237284172500, 292951012163242162500]

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

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