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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.

A280548 Number of n X n 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Table of values

n a(n)
1 0
2 0
3 50
4 382
5 1764
6 6502
7 20334
8 56102
9 141398
10 332810
11 743966
12 1598198
13 3328362
14 6763114

List of values

[0, 0, 50, 382, 1764, 6502, 20334, 56102, 141398, 332810, 743966, 1598198, 3328362, 6763114]

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

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