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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.

A194993 Number of lower triangles of an n X n 0..3 array with each element differing from all of its horizontal and vertical neighbors by one.

Table of values

n a(n)
1 4
2 10
3 42
4 248
5 2290
6 31042
7 641376
8 19753266
9 918924546
10 64065187024
11 6724991990090
12 1059952700132050
13 251257954485037072
14 89488725743024413554
15 47916300899545924260762
16 38558096411377540692559456

List of values

[4, 10, 42, 248, 2290, 31042, 641376, 19753266, 918924546, 64065187024, 6724991990090, 1059952700132050, 251257954485037072, 89488725743024413554, 47916300899545924260762, 38558096411377540692559456]

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

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