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.

A118870 Number of binary sequences of length n with no subsequence 0101.

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 15
5 28
6 53
7 100
8 188
9 354
10 667
11 1256
12 2365
13 4454
14 8388
15 15796
16 29747
17 56020
18 105497
19 198672
20 374140
21 704582
22 1326871
23 2498768
24 4705689
25 8861770
26 16688516
27 31427872
28 59185079
29 111457548
30 209897245
31 395279228
32 744391228
33 1401840170

List of values

[1, 2, 4, 8, 15, 28, 53, 100, 188, 354, 667, 1256, 2365, 4454, 8388, 15796, 29747, 56020, 105497, 198672, 374140, 704582, 1326871, 2498768, 4705689, 8861770, 16688516, 31427872, 59185079, 111457548, 209897245, 395279228, 744391228, 1401840170]

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

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