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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.

A189076 Number of compositions of n that avoid the pattern 23-1.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 8
5 16
6 31
7 61
8 118
9 228
10 440
11 846
12 1623
13 3111
14 5955
15 11385
16 21752
17 41530
18 79250
19 151161
20 288224
21 549408
22 1047034
23 1995000
24 3800662
25 7239710
26 13789219
27 26261678
28 50012275
29 95237360
30 181350695
31 345315255
32 657506300
33 1251912618
34 2383636280
35 4538364446

List of values

[1, 1, 2, 4, 8, 16, 31, 61, 118, 228, 440, 846, 1623, 3111, 5955, 11385, 21752, 41530, 79250, 151161, 288224, 549408, 1047034, 1995000, 3800662, 7239710, 13789219, 26261678, 50012275, 95237360, 181350695, 345315255, 657506300, 1251912618, 2383636280, 4538364446]

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

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