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.

A284218 Number of n X 4 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

Table of values

n a(n)
1 6
2 44
3 499
4 6511
5 91260
6 1317770
7 19371893
8 288303232
9 4330336770
10 65507133232
11 996599090507
12 15232184395483
13 233708530421124
14 3597476814925298
15 55530194727444557
16 859222993580853779
17 13322830756899018309

List of values

[6, 44, 499, 6511, 91260, 1317770, 19371893, 288303232, 4330336770, 65507133232, 996599090507, 15232184395483, 233708530421124, 3597476814925298, 55530194727444557, 859222993580853779, 13322830756899018309]

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

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