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.

A262421 Number of (2+1) X (n+1) 0..1 arrays with each row divisible by 3 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 5
2 4
3 45
4 114
5 709
6 2892
7 15293
8 72370
9 367125
10 1808844
11 9078925
12 45214674
13 226307429
14 1130307532
15 5653140573
16 28257215730
17 141297157045
18 706426855884
19 3532211260205
20 17660645718034
21 88303765183749
22 441515959527372

List of values

[5, 4, 45, 114, 709, 2892, 15293, 72370, 367125, 1808844, 9078925, 45214674, 226307429, 1130307532, 5653140573, 28257215730, 141297157045, 706426855884, 3532211260205, 17660645718034, 88303765183749, 441515959527372]

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

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