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.

A208901 Number of bitstrings of length n (with at least two runs) where the last two runs have different lengths.

Table of values

n a(n)
1 0
2 0
3 4
4 8
5 24
6 48
7 112
8 224
9 480
10 960
11 1984
12 3968
13 8064
14 16128
15 32512
16 65024
17 130560
18 261120
19 523264
20 1046528
21 2095104
22 4190208
23 8384512
24 16769024
25 33546240
26 67092480
27 134201344
28 268402688
29 536838144
30 1073676288
31 2147418112
32 4294836224
33 8589803520

List of values

[0, 0, 4, 8, 24, 48, 112, 224, 480, 960, 1984, 3968, 8064, 16128, 32512, 65024, 130560, 261120, 523264, 1046528, 2095104, 4190208, 8384512, 16769024, 33546240, 67092480, 134201344, 268402688, 536838144, 1073676288, 2147418112, 4294836224, 8589803520]

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

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