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.

A208868 Number of nX4 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 15
2 1798
3 307165
4 52947540
5 9130195864
6 1574432811027
7 271499374919883
8 46818078167209471
9 8073434644321782464
10 1392204668383719239473
11 240075497495975972163390
12 41399261047580372916745574

List of values

[15, 1798, 307165, 52947540, 9130195864, 1574432811027, 271499374919883, 46818078167209471, 8073434644321782464, 1392204668383719239473, 240075497495975972163390, 41399261047580372916745574]

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

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