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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.

A233266 Number of tilings of a 4 X n rectangle using tetrominoes of shapes L, T, Z.

Table of values

n a(n)
0 1
1 0
2 2
3 10
4 24
5 70
6 276
7 820
8 2616
9 8702
10 27902
11 89500
12 291050
13 939222
14 3029950
15 9798606
16 31657182
17 102237766
18 330356240
19 1067310022
20 3447911968
21 11139391996
22 35988377472
23 116265759012
24 375619824338
25 1213515477460
26 3920484872552
27 12665878390278

List of values

[1, 0, 2, 10, 24, 70, 276, 820, 2616, 8702, 27902, 89500, 291050, 939222, 3029950, 9798606, 31657182, 102237766, 330356240, 1067310022, 3447911968, 11139391996, 35988377472, 116265759012, 375619824338, 1213515477460, 3920484872552, 12665878390278]

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

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