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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.

A326367 Number of tilings of an equilateral triangle of side length n with unit triangles (of side length 1) and exactly two unit "lozenges" or "diamonds" (also of side length 1).

Table of values

n a(n)
1 0
2 0
3 24
4 126
5 387
6 915
7 1845
8 3339
9 5586
10 8802
11 13230
12 19140
13 26829
14 36621
15 48867
16 63945
17 82260
18 104244
19 130356
20 161082
21 196935
22 238455
23 286209
24 340791
25 402822
26 472950
27 551850
28 640224
29 738801
30 848337
31 969615
32 1103445
33 1250664
34 1412136
35 1588752
36 1781430
37 1991115

List of values

[0, 0, 24, 126, 387, 915, 1845, 3339, 5586, 8802, 13230, 19140, 26829, 36621, 48867, 63945, 82260, 104244, 130356, 161082, 196935, 238455, 286209, 340791, 402822, 472950, 551850, 640224, 738801, 848337, 969615, 1103445, 1250664, 1412136, 1588752, 1781430, 1991115]

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

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