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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.

A137402 a(n) = Sum_{k=0..n} binomial(floor(n-2k/3), k).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 5
5 9
6 16
7 28
8 48
9 81
10 136
11 229
12 388
13 661
14 1129
15 1928
16 3287
17 5594
18 9510
19 16164
20 27484
21 46757
22 79577
23 135454
24 230552
25 392355
26 667620
27 1135924
28 1932721
29 3288563
30 5595805
31 9522067
32 16203273
33 27572144
34 46917243
35 79834375
36 135845607
37 231154212

List of values

[1, 1, 2, 3, 5, 9, 16, 28, 48, 81, 136, 229, 388, 661, 1129, 1928, 3287, 5594, 9510, 16164, 27484, 46757, 79577, 135454, 230552, 392355, 667620, 1135924, 1932721, 3288563, 5595805, 9522067, 16203273, 27572144, 46917243, 79834375, 135845607, 231154212]

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

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