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.

A281198 Number of n X n 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

Table of values

n a(n)
1 0
2 2
3 56
4 270
5 1141
6 4248
7 14375
8 45614
9 138676
10 409976
11 1190740
12 3421202
13 9767347
14 27782656
15 78849645

List of values

[0, 2, 56, 270, 1141, 4248, 14375, 45614, 138676, 409976, 1190740, 3421202, 9767347, 27782656, 78849645]

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

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