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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.

A127869 Number of L-shaped tiles in all tilings of a 3 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

Table of values

n a(n)
2 12
3 60
4 432
5 2348
6 13144
7 69280
8 361012
9 1841736
10 9286900
11 46303316
12 228903592
13 1123242916
14 5477879120
15 26572232312
16 128302070508
17 616985221280
18 2956362520140
19 14120605179500
20 67252176519008
21 319477138444252
22 1514116534887688
23 7160712605686480
24 33799490762646948

List of values

[12, 60, 432, 2348, 13144, 69280, 361012, 1841736, 9286900, 46303316, 228903592, 1123242916, 5477879120, 26572232312, 128302070508, 616985221280, 2956362520140, 14120605179500, 67252176519008, 319477138444252, 1514116534887688, 7160712605686480, 33799490762646948]

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

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