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.

A208878 Number of 7Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.

Table of values

n a(n)
1 715
2 5826959
3 40380275500
4 271499374919883
5 1820216057105650386
6 12201956787655438957014
7 81798476241280856702695038
8 548357000894509223687629476021
9 3676054154412185019451007694406065

List of values

[715, 5826959, 40380275500, 271499374919883, 1820216057105650386, 12201956787655438957014, 81798476241280856702695038, 548357000894509223687629476021, 3676054154412185019451007694406065]

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

Content is available under The OEIS End-User License Agreement.