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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.

A008893 Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice.

Table of values

n a(n)
0 0
1 8
2 66
3 258
4 710
5 1590
6 3108
7 5516
8 9108
9 14220
10 21230
11 30558
12 42666
13 58058
14 77280
15 100920
16 129608
17 164016
18 204858
19 252890
20 308910
21 373758
22 448316
23 533508
24 630300
25 739700
26 862758
27 1000566
28 1154258
29 1325010
30 1514040
31 1722608
32 1952016
33 2203608
34 2478770

List of values

[0, 8, 66, 258, 710, 1590, 3108, 5516, 9108, 14220, 21230, 30558, 42666, 58058, 77280, 100920, 129608, 164016, 204858, 252890, 308910, 373758, 448316, 533508, 630300, 739700, 862758, 1000566, 1154258, 1325010, 1514040, 1722608, 1952016, 2203608, 2478770]

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

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