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.

A269069 Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 2
2 11
3 123
4 3288
5 165607
6 18220241
7 4064720816
8 1833956006577
9 1778703508587227
10 3374673365461249568
11 14101540722268888633757
12 114651904507399541002097761
13 2060026489521744559823250922304
14 72580676762280474254836112626897875

List of values

[2, 11, 123, 3288, 165607, 18220241, 4064720816, 1833956006577, 1778703508587227, 3374673365461249568, 14101540722268888633757, 114651904507399541002097761, 2060026489521744559823250922304, 72580676762280474254836112626897875]

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

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