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.

A351644 Number of length n word structures with all distinct runs using at most 3 symbols.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 9
5 21
6 46
7 108
8 223
9 487
10 1028
11 2060
12 4327
13 8591
14 16818
15 33562
16 64441
17 122983
18 232378
19 443446
20 816371
21 1503517
22 2775372
23 5052186
24 9116047
25 16231929
26 29182198
27 51503788
28 91032821
29 158301653
30 275776810
31 479642780
32 824964483
33 1414293391
34 2403093256
35 4095230980

List of values

[1, 1, 2, 4, 9, 21, 46, 108, 223, 487, 1028, 2060, 4327, 8591, 16818, 33562, 64441, 122983, 232378, 443446, 816371, 1503517, 2775372, 5052186, 9116047, 16231929, 29182198, 51503788, 91032821, 158301653, 275776810, 479642780, 824964483, 1414293391, 2403093256, 4095230980]

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

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