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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.

A019439 Number of ways of tiling a 2 X n rectangle with dominoes and trominoes.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 17
5 43
6 108
7 280
8 727
9 1875
10 4832
11 12470
12 32191
13 83075
14 214372
15 553214
16 1427673
17 3684333
18 9507936
19 24536616
20 63320419
21 163407771
22 421697922
23 1088253936
24 2808400703
25 7247494517
26 18703234038
27 48266468208
28 124558777387
29 321442392689
30 829529751892
31 2140724511882

List of values

[1, 1, 2, 6, 17, 43, 108, 280, 727, 1875, 4832, 12470, 32191, 83075, 214372, 553214, 1427673, 3684333, 9507936, 24536616, 63320419, 163407771, 421697922, 1088253936, 2808400703, 7247494517, 18703234038, 48266468208, 124558777387, 321442392689, 829529751892, 2140724511882]

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

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