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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.

A036403 Number of equilateral triangles whose vertices (whether connected by lines or not) lie at intersection points resulting from drawing lines connecting every pair of vertices of a regular 3n-gon (and extending beyond the polygon).

Table of values

n a(n)
1 1
2 126
3 3927
4 33156
5 97115
6 641916
7 537607
8 4222280
9 1744695
10 20962830
11 4003241
12 42626916

List of values

[1, 126, 3927, 33156, 97115, 641916, 537607, 4222280, 1744695, 20962830, 4003241, 42626916]

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

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