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.

A228500 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically, diagonally or antidiagonally.

Table of values

n a(n)
1 1
2 1
3 12
4 87
5 2002
6 59839
7 3862849
8 405580157
9 81304395949
10 28446567810005
11 18268841726936268
12 20937720031330292269
13 43502129718103134992611
14 162426195975365708781849519
15 1095156092719874995442597502324

List of values

[1, 1, 12, 87, 2002, 59839, 3862849, 405580157, 81304395949, 28446567810005, 18268841726936268, 20937720031330292269, 43502129718103134992611, 162426195975365708781849519, 1095156092719874995442597502324]

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

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