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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.

A129368 a(n) = Sum_{k=floor((n+1)/2)..n} binomial(2*k,k).

Table of values

n a(n)
0 1
1 2
2 8
3 26
4 96
5 342
6 1266
7 4678
8 17548
9 66098
10 250854
11 956034
12 3660190
13 14059866
14 54176466
15 209290554
16 810370944
17 3143964294
18 12219099594
19 47564314774
20 185410843594
21 723668533278
22 2827767496998
23 11061197519166

List of values

[1, 2, 8, 26, 96, 342, 1266, 4678, 17548, 66098, 250854, 956034, 3660190, 14059866, 54176466, 209290554, 810370944, 3143964294, 12219099594, 47564314774, 185410843594, 723668533278, 2827767496998, 11061197519166]

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

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