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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.

A164146 Number of binary strings of length n with equal numbers of 010 and 101 substrings.

Table of values

n a(n)
0 1
1 2
2 4
3 6
4 12
5 20
6 38
7 66
8 124
9 224
10 424
11 788
12 1502
13 2838
14 5438
15 10386
16 20004
17 38508
18 74516
19 144264
20 280216
21 544736
22 1061292
23 2069596
24 4042254
25 7902294
26 15466842
27 30297422
28 59404174
29 116558270
30 228876426
31 449713994
32 884199348
33 1739434972
34 3423770240
35 6742430340

List of values

[1, 2, 4, 6, 12, 20, 38, 66, 124, 224, 424, 788, 1502, 2838, 5438, 10386, 20004, 38508, 74516, 144264, 280216, 544736, 1061292, 2069596, 4042254, 7902294, 15466842, 30297422, 59404174, 116558270, 228876426, 449713994, 884199348, 1739434972, 3423770240, 6742430340]

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

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