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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.

A102699 Number of strings of length n, using as symbols numbers from the set {1, 2, ..., n}, in which consecutive symbols differ by exactly 1.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 16
5 42
6 104
7 252
8 592
9 1370
10 3112
11 6996
12 15536
13 34244
14 74832
15 162616
16 351136
17 754938
18 1615208
19 3443940
20 7314928
21 15493676
22 32714992
23 68918856
24 144815456
25 303703972
26 635554064
27 1327816392
28 2769049312
29 5766417480
30 11989472672
31 24897569648

List of values

[1, 1, 2, 6, 16, 42, 104, 252, 592, 1370, 3112, 6996, 15536, 34244, 74832, 162616, 351136, 754938, 1615208, 3443940, 7314928, 15493676, 32714992, 68918856, 144815456, 303703972, 635554064, 1327816392, 2769049312, 5766417480, 11989472672, 24897569648]

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

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