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.

A242206 Number of length n binary words which contain 00 and 01 and 10 and 11 as (possibly overlapping) contiguous subsequences.

Table of values

n a(n)
5 4
6 18
7 54
8 138
9 324
10 724
11 1568
12 3326
13 6954
14 14390
15 29552
16 60344
17 122684
18 248586
19 502366
20 1013122
21 2039804
22 4101532
23 8238520
24 16534390
25 33161554
26 66473198
27 133189224
28 266771328
29 534178324
30 1069385154
31 2140434438
32 4283561466
33 8571479604
34 17150008420
35 34311422672

List of values

[4, 18, 54, 138, 324, 724, 1568, 3326, 6954, 14390, 29552, 60344, 122684, 248586, 502366, 1013122, 2039804, 4101532, 8238520, 16534390, 33161554, 66473198, 133189224, 266771328, 534178324, 1069385154, 2140434438, 4283561466, 8571479604, 17150008420, 34311422672]

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

Content is available under The OEIS End-User License Agreement.