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.

A208374 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

Table of values

n a(n)
1 2
2 16
3 72
4 420
5 2176
6 10660
7 60984
8 340816
9 1846240
10 11076228
11 66303360
12 390426916
13 2456007216
14 15586002640
15 98058552648
16 645057461220
17 4299810563584
18 28563593727716
19 195777751059000
20 1361449965542992
21 9468978890210480

List of values

[2, 16, 72, 420, 2176, 10660, 60984, 340816, 1846240, 11076228, 66303360, 390426916, 2456007216, 15586002640, 98058552648, 645057461220, 4299810563584, 28563593727716, 195777751059000, 1361449965542992, 9468978890210480]

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

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