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.

A269103 Number of n X 2 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.

Table of values

n a(n)
1 16
2 180
3 1740
4 15540
5 132300
6 1090740
7 8787660
8 69580980
9 543538380
10 4200069300
11 32167589580
12 244542858420
13 1847388128460
14 13880833735860
15 103809654007500
16 773174303047860
17 5737767196302540
18 42443199898890420
19 313054205965641420

List of values

[16, 180, 1740, 15540, 132300, 1090740, 8787660, 69580980, 543538380, 4200069300, 32167589580, 244542858420, 1847388128460, 13880833735860, 103809654007500, 773174303047860, 5737767196302540, 42443199898890420, 313054205965641420]

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

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