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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.

A253265 The number of tilings of 2 X n boards with squares of 2 colors and dominoes of 3 colors.

Table of values

n a(n)
0 1
1 7
2 82
3 877
4 9565
5 103960
6 1130701
7 12296275
8 133724242
9 1454268793
10 15815379409
11 171994465072
12 1870463946217
13 20341557798991
14 221217294787570
15 2405769114915733
16 26163076626035413
17 284527128680078536
18 3094272440210485525
19 33650646877362841531
20 365955505581792121138

List of values

[1, 7, 82, 877, 9565, 103960, 1130701, 12296275, 133724242, 1454268793, 15815379409, 171994465072, 1870463946217, 20341557798991, 221217294787570, 2405769114915733, 26163076626035413, 284527128680078536, 3094272440210485525, 33650646877362841531, 365955505581792121138]

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

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