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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.

A050231 a(n) is the number of n-tosses having a run of 3 or more heads for a fair coin (i.e., probability is a(n)/2^n).

Table of values

n a(n)
1 0
2 0
3 1
4 3
5 8
6 20
7 47
8 107
9 238
10 520
11 1121
12 2391
13 5056
14 10616
15 22159
16 46023
17 95182
18 196132
19 402873
20 825259
21 1686408
22 3438828
23 6999071
24 14221459
25 28853662
26 58462800
27 118315137
28 239186031
29 483072832
30 974791728
31 1965486047
32 3960221519
33 7974241118
34 16047432332
35 32276862265

List of values

[0, 0, 1, 3, 8, 20, 47, 107, 238, 520, 1121, 2391, 5056, 10616, 22159, 46023, 95182, 196132, 402873, 825259, 1686408, 3438828, 6999071, 14221459, 28853662, 58462800, 118315137, 239186031, 483072832, 974791728, 1965486047, 3960221519, 7974241118, 16047432332, 32276862265]

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

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