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.

A289670 Consider the Post tag system defined in A284116; a(n) = number of binary words of length n which terminate at the empty word.

Table of values

n a(n)
1 2
2 2
3 4
4 8
5 16
6 16
7 64
8 128
9 192
10 320
11 512
12 768
13 2560
14 6656
15 12288
16 21504
17 36864
18 81920
19 176128
20 327680
21 638976
22 1392640
23 2326528
24 4194304
25 9568256
26 17301504
27 30408704
28 65536000
29 121110528
30 220200960
31 484442112
32 962592768
33 1837105152
34 4026531840
35 8304721920
36 16206790656
37 34712059904
38 70934069248
39 140190416896

List of values

[2, 2, 4, 8, 16, 16, 64, 128, 192, 320, 512, 768, 2560, 6656, 12288, 21504, 36864, 81920, 176128, 327680, 638976, 1392640, 2326528, 4194304, 9568256, 17301504, 30408704, 65536000, 121110528, 220200960, 484442112, 962592768, 1837105152, 4026531840, 8304721920, 16206790656, 34712059904, 70934069248, 140190416896]

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

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