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.

A195226 Number of lower triangles of an n X n 0..2 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.

Table of values

n a(n)
1 3
2 15
3 155
4 3151
5 127785
6 10322065
7 1663418313
8 535153390177
9 343932423395227
10 441776066934784687
11 1134608168927438377475
12 5828490619001307113164495
13 59904949456032239303490933489
14 1232191818850202836476827846621041

List of values

[3, 15, 155, 3151, 127785, 10322065, 1663418313, 535153390177, 343932423395227, 441776066934784687, 1134608168927438377475, 5828490619001307113164495, 59904949456032239303490933489, 1232191818850202836476827846621041]

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

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