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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.

A127864 Number of tilings of a 2 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)
0 1
1 1
2 5
3 11
4 33
5 87
6 241
7 655
8 1793
9 4895
10 13377
11 36543
12 99841
13 272767
14 745217
15 2035967
16 5562369
17 15196671
18 41518081
19 113429503
20 309895169
21 846649343
22 2313089025
23 6319476735
24 17265131521
25 47169216511
26 128868696065
27 352075825151
28 961889042433
29 2627929735167

List of values

[1, 1, 5, 11, 33, 87, 241, 655, 1793, 4895, 13377, 36543, 99841, 272767, 745217, 2035967, 5562369, 15196671, 41518081, 113429503, 309895169, 846649343, 2313089025, 6319476735, 17265131521, 47169216511, 128868696065, 352075825151, 961889042433, 2627929735167]

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

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