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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.

A026008 a(n) = T(n, floor(n/2)), where T = Catalan triangle (A008315).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 5
5 9
6 14
7 28
8 42
9 90
10 132
11 297
12 429
13 1001
14 1430
15 3432
16 4862
17 11934
18 16796
19 41990
20 58786
21 149226
22 208012
23 534888
24 742900
25 1931540
26 2674440
27 7020405
28 9694845
29 25662825
30 35357670
31 94287120
32 129644790
33 347993910
34 477638700
35 1289624490
36 1767263190

List of values

[1, 1, 2, 3, 5, 9, 14, 28, 42, 90, 132, 297, 429, 1001, 1430, 3432, 4862, 11934, 16796, 41990, 58786, 149226, 208012, 534888, 742900, 1931540, 2674440, 7020405, 9694845, 25662825, 35357670, 94287120, 129644790, 347993910, 477638700, 1289624490, 1767263190]

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

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