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.

A195227 Number of lower triangles of an n X n 0..3 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 4
2 22
3 246
4 5428
5 237818
6 20729610
7 3601738548
8 1249159521262
9 865793424024974
10 1200356073563114252
11 3331551471246807302142
12 18523112376180844925948966
13 206425939461681776649215679048
14 4613382950875473008207859661034814

List of values

[4, 22, 246, 5428, 237818, 20729610, 3601738548, 1249159521262, 865793424024974, 1200356073563114252, 3331551471246807302142, 18523112376180844925948966, 206425939461681776649215679048, 4613382950875473008207859661034814]

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

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