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.

A207863 Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors).

Table of values

n a(n)
1 1
2 4
3 2052
4 455546040
5 103204230192540988
6 47890666906311937749901098886
7 81523212441914346544073433818166292337910075
8 839780322234263638551379612300530069754865868713324092842519030
9 81184462760528172324981018065090176893681709356914242351556151349811667519060498973390

List of values

[1, 4, 2052, 455546040, 103204230192540988, 47890666906311937749901098886, 81523212441914346544073433818166292337910075, 839780322234263638551379612300530069754865868713324092842519030, 81184462760528172324981018065090176893681709356914242351556151349811667519060498973390]

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

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