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.

A263798 Number of (n+1)X(7+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, and rows and columns lexicographically nonincreasing.

Table of values

n a(n)
1 5
2 5
3 25
4 56
5 494
6 4991
7 62904
8 760671
9 8468941
10 90476206
11 850301770
12 7703098612
13 62160939006
14 482749236704
15 3416830587073
16 23238401292501
17 146883022822593
18 892090634118666
19 5108443008090443
20 28144017611172958
21 147708619212786406

List of values

[5, 5, 25, 56, 494, 4991, 62904, 760671, 8468941, 90476206, 850301770, 7703098612, 62160939006, 482749236704, 3416830587073, 23238401292501, 146883022822593, 892090634118666, 5108443008090443, 28144017611172958, 147708619212786406]

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

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