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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.

A195244 Number of lower triangles of an n X n 0..4 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.

Table of values

n a(n)
1 5
2 65
3 2729
4 357847
5 147824001
6 192172956591
7 786909681200387
8 10151817642632605643
9 412697709382902984293947
10 52873327059079066189496492173
11 21349480944940442832764307444766199

List of values

[5, 65, 2729, 357847, 147824001, 192172956591, 786909681200387, 10151817642632605643, 412697709382902984293947, 52873327059079066189496492173, 21349480944940442832764307444766199]

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

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