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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.

A326369 Number of tilings of an equilateral triangle of side length n with unit triangles (of side length 1) and exactly four unit "lozenges" or "diamonds" (also of side length 1).

Table of values

n a(n)
1 0
2 0
3 0
4 762
5 12699
6 90270
7 417435
8 1478160
9 4354497
10 11203269
11 25970895
12 55414395
13 110505120
14 208300257
15 374375664
16 645922095
17 1075615380
18 1736379630
19 2727171042
20 4179918384
21 6267764745
22 9214763640
23 13307191065
24 18906643602
25 26465101179
26 36542141595
27 49824502425

List of values

[0, 0, 0, 762, 12699, 90270, 417435, 1478160, 4354497, 11203269, 25970895, 55414395, 110505120, 208300257, 374375664, 645922095, 1075615380, 1736379630, 2727171042, 4179918384, 6267764745, 9214763640, 13307191065, 18906643602, 26465101179, 36542141595, 49824502425]

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

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