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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.

A373080 a(n) is the number of binary strings of length n not containing the substrings 0000, 0001, 0011, 0111, 1111.

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 11
5 18
6 28
7 40
8 64
9 96
10 144
11 224
12 336
13 512
14 784
15 1184
16 1808
17 2752
18 4176
19 6368
20 9680
21 14720
22 22416
23 34080
24 51856
25 78912
26 120016
27 182624
28 277840
29 422656
30 643088
31 978336
32 1488400
33 2264512
34 3445072
35 5241312
36 7974096
37 12131456
38 18456720
39 28079648

List of values

[1, 2, 4, 8, 11, 18, 28, 40, 64, 96, 144, 224, 336, 512, 784, 1184, 1808, 2752, 4176, 6368, 9680, 14720, 22416, 34080, 51856, 78912, 120016, 182624, 277840, 422656, 643088, 978336, 1488400, 2264512, 3445072, 5241312, 7974096, 12131456, 18456720, 28079648]

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

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