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.

A303249 Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 14
3 49
4 250
5 1183
6 5918
7 28680
8 141255
9 691968
10 3391358
11 16627204
12 81517689
13 399591042
14 1958997017
15 9603668921
16 47080079771
17 230803211309
18 1131476255863
19 5546875012244
20 27192677194545
21 133307748424215
22 653519804327678

List of values

[1, 14, 49, 250, 1183, 5918, 28680, 141255, 691968, 3391358, 16627204, 81517689, 399591042, 1958997017, 9603668921, 47080079771, 230803211309, 1131476255863, 5546875012244, 27192677194545, 133307748424215, 653519804327678]

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

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