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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.

A200796 Number of nX3 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

Table of values

n a(n)
1 5
2 178
3 9880
4 583813
5 34679839
6 2060918000
7 122478253815
8 7278777317468
9 432571571252989
10 25707362563355693
11 1527766813187552208
12 90793889493222901029
13 5395804057415427972197
14 320668071260622898796015

List of values

[5, 178, 9880, 583813, 34679839, 2060918000, 122478253815, 7278777317468, 432571571252989, 25707362563355693, 1527766813187552208, 90793889493222901029, 5395804057415427972197, 320668071260622898796015]

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

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