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.

A209219 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 1 1 vertically.

Table of values

n a(n)
1 2
2 16
3 60
4 196
5 900
6 5476
7 38232
8 287296
9 3132576
10 37625956
11 515992736
12 9773299600
13 197179936872
14 5340055452736
15 166631085360000
16 6057724646680996
17 305548384194976300
18 15689243192533764624
19 1137621414073872082528

List of values

[2, 16, 60, 196, 900, 5476, 38232, 287296, 3132576, 37625956, 515992736, 9773299600, 197179936872, 5340055452736, 166631085360000, 6057724646680996, 305548384194976300, 15689243192533764624, 1137621414073872082528]

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

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