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.

A303193 Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 5
2 17
3 23
4 46
5 185
6 497
7 1357
8 4207
9 12167
10 34473
11 102325
12 299504
13 863917
14 2529911
15 7401255
16 21512919
17 62790998
18 183429084
19 534568781
20 1559375192
21 4551720900
22 13275818353
23 38726475676
24 113002176247
25 329660705673
26 961703508351

List of values

[5, 17, 23, 46, 185, 497, 1357, 4207, 12167, 34473, 102325, 299504, 863917, 2529911, 7401255, 21512919, 62790998, 183429084, 534568781, 1559375192, 4551720900, 13275818353, 38726475676, 113002176247, 329660705673, 961703508351]

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

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