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.

A241103 Number of n X 3 0..2 arrays with no element equal to one or three horizontal or vertical neighbors, with new values 0..2 introduced in row major order.

Table of values

n a(n)
1 2
2 11
3 58
4 294
5 1522
6 7846
7 40418
8 208374
9 1074002
10 5535686
11 28533058
12 147068694
13 758041522
14 3907203046
15 20139040418
16 103803409974
17 535037802002
18 2757765332486
19 14214452973058
20 73266086411094
21 377638128337522

List of values

[2, 11, 58, 294, 1522, 7846, 40418, 208374, 1074002, 5535686, 28533058, 147068694, 758041522, 3907203046, 20139040418, 103803409974, 535037802002, 2757765332486, 14214452973058, 73266086411094, 377638128337522]

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

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