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.

A261983 Number of compositions of n such that at least two adjacent parts are equal.

Table of values

n a(n)
0 0
1 0
2 1
3 1
4 4
5 9
6 18
7 41
8 89
9 185
10 388
11 810
12 1670
13 3435
14 7040
15 14360
16 29226
17 59347
18 120229
19 243166
20 491086
21 990446
22 1995410
23 4016259
24 8076960
25 16231746
26 32599774
27 65437945
28 131293192
29 263316897
30 527912140
31 1058061751
32 2120039885
33 4246934012
34 8505864640

List of values

[0, 0, 1, 1, 4, 9, 18, 41, 89, 185, 388, 810, 1670, 3435, 7040, 14360, 29226, 59347, 120229, 243166, 491086, 990446, 1995410, 4016259, 8076960, 16231746, 32599774, 65437945, 131293192, 263316897, 527912140, 1058061751, 2120039885, 4246934012, 8505864640]

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

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