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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.

A384497 a(n) is the number of binary strings of length n which contain exactly one run of 1s of even length.

Table of values

n a(n)
0 0
1 0
2 1
3 2
4 6
5 12
6 28
7 56
8 119
9 236
10 479
11 940
12 1859
13 3612
14 7028
15 13538
16 26051
17 49820
18 95098
19 180774
20 342944
21 648648
22 1224517
23 2306338
24 4336449
25 8138516
26 15250965
27 28535528
28 53320792
29 99504804
30 185474501
31 345332950
32 642310142
33 1193510160
34 2215702468
35 4109801864

List of values

[0, 0, 1, 2, 6, 12, 28, 56, 119, 236, 479, 940, 1859, 3612, 7028, 13538, 26051, 49820, 95098, 180774, 342944, 648648, 1224517, 2306338, 4336449, 8138516, 15250965, 28535528, 53320792, 99504804, 185474501, 345332950, 642310142, 1193510160, 2215702468, 4109801864]

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

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