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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.

A230735 Number of (n+3)X(n+3) 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Table of values

n a(n)
1 2
2 66
3 2106
4 320970
5 43853402
6 36695929036
7 26681634560690
8 121531720205091748
9 479398570293769095556
10 11869733818244916838154264

List of values

[2, 66, 2106, 320970, 43853402, 36695929036, 26681634560690, 121531720205091748, 479398570293769095556, 11869733818244916838154264]

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

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