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.

A134044 Number of compositions of n with parts in N which avoid the pattern 221.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 8
5 15
6 30
7 58
8 113
9 220
10 429
11 835
12 1627
13 3169
14 6172
15 12023
16 23419
17 45616
18 88853
19 173073
20 337118
21 656656
22 1279065
23 2491423
24 4852911
25 9452731
26 18412473
27 35864686
28 69858930
29 136074521
30 265052378
31 516281541
32 1005637564
33 1958828336

List of values

[1, 1, 2, 4, 8, 15, 30, 58, 113, 220, 429, 835, 1627, 3169, 6172, 12023, 23419, 45616, 88853, 173073, 337118, 656656, 1279065, 2491423, 4852911, 9452731, 18412473, 35864686, 69858930, 136074521, 265052378, 516281541, 1005637564, 1958828336]

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

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