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.

A282880 Number of nX3 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.

Table of values

n a(n)
1 1
2 8
3 74
4 430
5 2426
6 13062
7 67676
8 342972
9 1707597
10 8384136
11 40716024
12 195950228
13 935955604
14 4442192472
15 20968437076
16 98509310972
17 460879910601
18 2148369624844
19 9981992555058
20 46244594782978
21 213681269956154
22 985012878231418

List of values

[1, 8, 74, 430, 2426, 13062, 67676, 342972, 1707597, 8384136, 40716024, 195950228, 935955604, 4442192472, 20968437076, 98509310972, 460879910601, 2148369624844, 9981992555058, 46244594782978, 213681269956154, 985012878231418]

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

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