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.

A181220 Number of n X 4 binary matrices with no three 1's adjacent in a line horizontally, vertically, diagonally or antidiagonally.

Table of values

n a(n)
1 13
2 169
3 1209
4 10732
5 97764
6 845531
7 7426986
8 65480503
9 574725752
10 5050028956
11 44391722285
12 390072820213
13 3427866363455
14 30124436697657
15 264728435711181
16 2326400950974628
17 20444198985083330
18 179661312288590309

List of values

[13, 169, 1209, 10732, 97764, 845531, 7426986, 65480503, 574725752, 5050028956, 44391722285, 390072820213, 3427866363455, 30124436697657, 264728435711181, 2326400950974628, 20444198985083330, 179661312288590309]

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

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