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.

A268998 Number of 4Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 16
2 126
3 849
4 6009
5 37987
6 244397
7 1506570
8 9258784
9 55904997
10 335264275
11 1991983545
12 11763490813
13 69051103048
14 403375829894
15 2346089237885
16 13593697842329
17 78497992061491
18 451930855824889
19 2594820580805818

List of values

[16, 126, 849, 6009, 37987, 244397, 1506570, 9258784, 55904997, 335264275, 1991983545, 11763490813, 69051103048, 403375829894, 2346089237885, 13593697842329, 78497992061491, 451930855824889, 2594820580805818]

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

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