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.

A302228 Number of 5Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 0
2 111
3 675
4 4237
5 40395
6 338204
7 3018243
8 26373655
9 229022022
10 2020776808
11 17623530150
12 154526692002
13 1354126269239
14 11852307962264
15 103884063578946
16 909810907872807
17 7970268921853663
18 69825955304629074
19 611653034702238664

List of values

[0, 111, 675, 4237, 40395, 338204, 3018243, 26373655, 229022022, 2020776808, 17623530150, 154526692002, 1354126269239, 11852307962264, 103884063578946, 909810907872807, 7970268921853663, 69825955304629074, 611653034702238664]

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

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