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.

A208169 Number of n X n 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 neighbors.

Table of values

n a(n)
1 1
2 13
3 8469
4 99752346
5 16567902881244
6 38625516979536823947
7 1263976383376771173195964686
8 580579239138791881884932674640711196
9 3743190521310525744113304412007474906812935048

List of values

[1, 13, 8469, 99752346, 16567902881244, 38625516979536823947, 1263976383376771173195964686, 580579239138791881884932674640711196, 3743190521310525744113304412007474906812935048]

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

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