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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.

A135491 Number of ways to toss a coin n times and not get a run of four.

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 14
5 26
6 48
7 88
8 162
9 298
10 548
11 1008
12 1854
13 3410
14 6272
15 11536
16 21218
17 39026
18 71780
19 132024
20 242830
21 446634
22 821488
23 1510952
24 2779074
25 5111514
26 9401540
27 17292128
28 31805182
29 58498850
30 107596160
31 197900192
32 363995202
33 669491554
34 1231386948
35 2264873704

List of values

[1, 2, 4, 8, 14, 26, 48, 88, 162, 298, 548, 1008, 1854, 3410, 6272, 11536, 21218, 39026, 71780, 132024, 242830, 446634, 821488, 1510952, 2779074, 5111514, 9401540, 17292128, 31805182, 58498850, 107596160, 197900192, 363995202, 669491554, 1231386948, 2264873704]

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

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