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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.

A054856 Number of ways to tile a 4 X n region with 1 X 1, 2 X 2, 3 X 3 and 4 X 4 tiles.

Table of values

n a(n)
0 1
1 1
2 5
3 13
4 40
5 117
6 348
7 1029
8 3049
9 9028
10 26738
11 79183
12 234502
13 694476
14 2056692
15 6090891
16 18038173
17 53420041
18 158203433
19 468519406
20 1387520047
21 4109140098
22 12169216863
23 36039131181
24 106729873498
25 316080480394
26 936072224321

List of values

[1, 1, 5, 13, 40, 117, 348, 1029, 3049, 9028, 26738, 79183, 234502, 694476, 2056692, 6090891, 18038173, 53420041, 158203433, 468519406, 1387520047, 4109140098, 12169216863, 36039131181, 106729873498, 316080480394, 936072224321]

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

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