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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.

A208900 Number of bitstrings of length n which (if having two or more runs) the last two runs have different lengths.

Table of values

n a(n)
1 2
2 2
3 6
4 10
5 26
6 50
7 114
8 226
9 482
10 962
11 1986
12 3970
13 8066
14 16130
15 32514
16 65026
17 130562
18 261122
19 523266
20 1046530
21 2095106
22 4190210
23 8384514
24 16769026
25 33546242
26 67092482
27 134201346
28 268402690
29 536838146
30 1073676290
31 2147418114
32 4294836226
33 8589803522

List of values

[2, 2, 6, 10, 26, 50, 114, 226, 482, 962, 1986, 3970, 8066, 16130, 32514, 65026, 130562, 261122, 523266, 1046530, 2095106, 4190210, 8384514, 16769026, 33546242, 67092482, 134201346, 268402690, 536838146, 1073676290, 2147418114, 4294836226, 8589803522]

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

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