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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.

A247124 Number of tilings of a 5 X n rectangle using n pentominoes of shapes I, U, X.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 3
5 8
6 14
7 21
8 37
9 63
10 122
11 221
12 374
13 656
14 1147
15 2066
16 3699
17 6477
18 11407
19 20099
20 35656
21 63323
22 111775
23 197352
24 348556
25 616560
26 1091570
27 1929721
28 3410509
29 6028021
30 10658114
31 18851012
32 33331681
33 58927069
34 104177155
35 184188343
36 325686763
37 575858676

List of values

[1, 1, 1, 2, 3, 8, 14, 21, 37, 63, 122, 221, 374, 656, 1147, 2066, 3699, 6477, 11407, 20099, 35656, 63323, 111775, 197352, 348556, 616560, 1091570, 1929721, 3410509, 6028021, 10658114, 18851012, 33331681, 58927069, 104177155, 184188343, 325686763, 575858676]

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

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