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.

A263054 Number of (n+1) X (2+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits.

Table of values

n a(n)
1 2
2 33
3 142
4 895
5 4314
6 22921
7 113486
8 577071
9 2877562
10 14455993
11 72225582
12 361607935
13 1807659674
14 9041669481
15 45205690126
16 226052092111
17 1130241870522
18 5651375017753
19 28256745002222
20 141284885366175
21 706423516399834

List of values

[2, 33, 142, 895, 4314, 22921, 113486, 577071, 2877562, 14455993, 72225582, 361607935, 1807659674, 9041669481, 45205690126, 226052092111, 1130241870522, 5651375017753, 28256745002222, 141284885366175, 706423516399834]

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

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