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.

A232949 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero.

Table of values

n a(n)
1 1
2 21
3 1881
4 685251
5 1074244299
6 7168373617095
7 205030957086979647
8 25121788915317351455997
9 13201474923932116066095060171
10 29758989052767328125373420316820645

List of values

[1, 21, 1881, 685251, 1074244299, 7168373617095, 205030957086979647, 25121788915317351455997, 13201474923932116066095060171, 29758989052767328125373420316820645]

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

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