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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.

A219968 Number of tilings of a 3 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 3
5 4
6 8
7 13
8 19
9 35
10 58
11 89
12 154
13 256
14 405
15 681
16 1131
17 1822
18 3025
19 5012
20 8156
21 13465
22 22257
23 36415
24 59976
25 98961
26 162370
27 267184
28 440335
29 723521
30 1190237
31 1960146
32 3223045
33 5301876
34 8727650
35 14355677
36 23615683
37 38865307
38 63937660
39 105184761

List of values

[1, 1, 1, 2, 3, 4, 8, 13, 19, 35, 58, 89, 154, 256, 405, 681, 1131, 1822, 3025, 5012, 8156, 13465, 22257, 36415, 59976, 98961, 162370, 267184, 440335, 723521, 1190237, 1960146, 3223045, 5301876, 8727650, 14355677, 23615683, 38865307, 63937660, 105184761]

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

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