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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.

A230660 Number of nX7 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 0
2 63
3 1155
4 11745
5 477279
6 3951657
7 169006665
8 1374288243
9 59075291211
10 479621050353
11 20625942501183
12 167435671598913
13 7200781142959245
14 58453268091967479
15 2513864130034802115
16 20406595554618417837

List of values

[0, 63, 1155, 11745, 477279, 3951657, 169006665, 1374288243, 59075291211, 479621050353, 20625942501183, 167435671598913, 7200781142959245, 58453268091967479, 2513864130034802115, 20406595554618417837]

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

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