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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.

A326368 Number of tilings of an equilateral triangle of side length n with unit triangles (of side length 1) and exactly three unit "lozenges" or "diamonds" (also of side length 1).

Table of values

n a(n)
1 0
2 0
3 18
4 434
5 2814
6 11127
7 33365
8 83568
9 184254
10 369254
11 686952
12 1203930
13 2009018
14 3217749
15 4977219
16 7471352
17 10926570
18 15617868
19 21875294
20 30090834
21 40725702
22 54318035
23 71490993
24 92961264
25 119547974
26 152182002
27 191915700
28 239933018
29 297560034
30 366275889

List of values

[0, 0, 18, 434, 2814, 11127, 33365, 83568, 184254, 369254, 686952, 1203930, 2009018, 3217749, 4977219, 7471352, 10926570, 15617868, 21875294, 30090834, 40725702, 54318035, 71490993, 92961264, 119547974, 152182002, 191915700, 239933018, 297560034, 366275889]

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

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