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.

A243862 Number of length n sequences on alphabet {0,1,2} that contain all of 00, 01, 02, 10, 11, 12, 20, 21, 22 as (possibly overlapping) contiguous subsequences.

Table of values

n a(n)
10 216
11 2160
12 14544
13 78840
14 374568
15 1623420
16 6580848
17 25350384
18 93835368
19 336429336
20 1175333232
21 4019312448
22 13502627088
23 44688347724
24 146041135932
25 472142876544
26 1512373800624
27 4806068123880
28 15168176407512
29 47586553527408
30 148517566558116
31 461424138047280

List of values

[216, 2160, 14544, 78840, 374568, 1623420, 6580848, 25350384, 93835368, 336429336, 1175333232, 4019312448, 13502627088, 44688347724, 146041135932, 472142876544, 1512373800624, 4806068123880, 15168176407512, 47586553527408, 148517566558116, 461424138047280]

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

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