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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.

A385159 Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join a circle through every unordered triple of non-collinear points: a(n) is the number of distinct circles created.

Table of values

n a(n)
1 1
2 18
3 99
4 280
5 633
6 1098
7 1915
8 2928
9 4329
10 6010
11 8331
12 10752
13 14113
14 17778
15 21987

List of values

[1, 18, 99, 280, 633, 1098, 1915, 2928, 4329, 6010, 8331, 10752, 14113, 17778, 21987]

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

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