cp's OEIS Frontend

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.

A219969 Number of tilings of a 5 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.

Table of values

n a(n)
0 1
1 0
2 2
3 4
4 8
5 28
6 65
7 170
8 456
9 1177
10 3068
11 8016
12 21028
13 54696
14 142908
15 374527
16 976022
17 2551162
18 6674999
19 17422250
20 45536000
21 119053392
22 310969076
23 812695944
24 2124175469
25 5550025712
26 14503987368
27 37905500955
28 99050326532
29 258846292750
30 676453686574

List of values

[1, 0, 2, 4, 8, 28, 65, 170, 456, 1177, 3068, 8016, 21028, 54696, 142908, 374527, 976022, 2551162, 6674999, 17422250, 45536000, 119053392, 310969076, 812695944, 2124175469, 5550025712, 14503987368, 37905500955, 99050326532, 258846292750, 676453686574]

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

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