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.

A243210 Number of inequivalent (mod D_3) ways to place 5 points on a triangular grid of side n so that no three of them are vertices of an equilateral triangle with sides parallel to the grid.

Table of values

n a(n)
3 0
4 11
5 266
6 2344
7 12907
8 53307
9 180876
10 530654
11 1391647
12 3335627
13 7426885
14 15544434
15 30867669
16 58574800
17 106838511
18 188190111
19 321383808
20 533857914

List of values

[0, 11, 266, 2344, 12907, 53307, 180876, 530654, 1391647, 3335627, 7426885, 15544434, 30867669, 58574800, 106838511, 188190111, 321383808, 533857914]

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

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