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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.

A195251 Number of lower triangles of a 5X5 0..n 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 32768
2 14348907
3 67379894
4 147824001
5 237368212
6 329060365
7 421064386
8 513095495
9 605126604
10 697157713
11 789188822
12 881219931
13 973251040
14 1065282149
15 1157313258
16 1249344367
17 1341375476
18 1433406585
19 1525437694
20 1617468803

List of values

[32768, 14348907, 67379894, 147824001, 237368212, 329060365, 421064386, 513095495, 605126604, 697157713, 789188822, 881219931, 973251040, 1065282149, 1157313258, 1249344367, 1341375476, 1433406585, 1525437694, 1617468803]

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

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