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.

A262327 Number of (n+1) X (3+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits.

Table of values

n a(n)
1 6
2 15
3 90
4 351
5 2106
6 10935
7 65610
8 378351
9 2270106
10 13482855
11 80897130
12 484142751
13 2904856506
14 17417978775
15 104507872650
16 626946793551
17 3761680761306
18 22569180586695
19 135415083520170
20 812482365290751
21 4874894191744506

List of values

[6, 15, 90, 351, 2106, 10935, 65610, 378351, 2270106, 13482855, 80897130, 484142751, 2904856506, 17417978775, 104507872650, 626946793551, 3761680761306, 22569180586695, 135415083520170, 812482365290751, 4874894191744506]

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

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