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.

A207689 Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically.

Table of values

n a(n)
1 9
2 81
3 100
4 256
5 576
6 1156
7 2500
8 5476
9 11664
10 24964
11 53824
12 115600
13 248004
14 532900
15 1144900
16 2458624
17 5280804
18 11343424
19 24364096
20 52330756
21 112402404
22 241429444
23 518563984
24 1113823876
25 2392383744
26 5138595856
27 11037183364
28 23706760900

List of values

[9, 81, 100, 256, 576, 1156, 2500, 5476, 11664, 24964, 53824, 115600, 248004, 532900, 1144900, 2458624, 5280804, 11343424, 24364096, 52330756, 112402404, 241429444, 518563984, 1113823876, 2392383744, 5138595856, 11037183364, 23706760900]

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

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