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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.

A100137 a(n) = Sum_{k=0..floor(n/6)} C(n-3k,3k) * 2^(n-6k).

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 16
5 32
6 65
7 136
8 296
9 672
10 1584
11 3840
12 9473
13 23566
14 58736
15 146080
16 361760
17 891328
18 2184961
19 5331476
20 12958684
21 31400160
22 75910320
23 183220800
24 441787201
25 1064687642
26 2565404524
27 6181873208
28 14899796416
29 35922756992
30 86635757825

List of values

[1, 2, 4, 8, 16, 32, 65, 136, 296, 672, 1584, 3840, 9473, 23566, 58736, 146080, 361760, 891328, 2184961, 5331476, 12958684, 31400160, 75910320, 183220800, 441787201, 1064687642, 2565404524, 6181873208, 14899796416, 35922756992, 86635757825]

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

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