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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.

A030037 a(n+1) = Sum_{k=0..floor(2*n/5)} a(k) * a(n-k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 3
6 6
7 11
8 20
9 40
10 77
11 160
12 319
13 636
14 1332
15 2721
16 5799
17 12068
18 25109
19 53943
20 113682
21 245931
22 523896
23 1115239
24 2425858
25 5208339
26 11388934
27 24630843
28 53194684
29 116764483
30 253764437
31 559289434
32 1221970242
33 2666776056
34 5889628123
35 12910470041
36 28608337855

List of values

[1, 1, 1, 1, 2, 3, 6, 11, 20, 40, 77, 160, 319, 636, 1332, 2721, 5799, 12068, 25109, 53943, 113682, 245931, 523896, 1115239, 2425858, 5208339, 11388934, 24630843, 53194684, 116764483, 253764437, 559289434, 1221970242, 2666776056, 5889628123, 12910470041, 28608337855]

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

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