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.

A242544 Number of length n+3 0..3 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..3 introduced in 0..3 order.

Table of values

n a(n)
1 13
2 42
3 150
4 554
5 2072
6 7808
7 29536
8 111878
9 423969
10 1607058
11 6092367
12 23097242
13 87566957
14 331989206
15 1258663594
16 4771951574
17 18091832688
18 68591328768
19 260049450816
20 985922294306
21 3737915147525
22 14171512153838
23 53728281674119

List of values

[13, 42, 150, 554, 2072, 7808, 29536, 111878, 423969, 1607058, 6092367, 23097242, 87566957, 331989206, 1258663594, 4771951574, 18091832688, 68591328768, 260049450816, 985922294306, 3737915147525, 14171512153838, 53728281674119]

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

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