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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.

A188900 Number of compositions of n that avoid the pattern 12-3.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 8
5 16
6 31
7 60
8 114
9 215
10 402
11 746
12 1375
13 2520
14 4593
15 8329
16 15036
17 27027
18 48389
19 86314
20 153432
21 271853
22 480207
23 845804
24 1485703
25 2603018
26 4549521
27 7933239
28 13803293
29 23966682
30 41530721
31 71830198
32 124010381
33 213725823
34 367736268
35 631723139
36 1083568861

List of values

[1, 1, 2, 4, 8, 16, 31, 60, 114, 215, 402, 746, 1375, 2520, 4593, 8329, 15036, 27027, 48389, 86314, 153432, 271853, 480207, 845804, 1485703, 2603018, 4549521, 7933239, 13803293, 23966682, 41530721, 71830198, 124010381, 213725823, 367736268, 631723139, 1083568861]

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

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