cp's OEIS Frontend

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.

A028304 a(n) = ceiling( binomial(n, floor(n/2))/(1 + ceiling(n/2)) ) (interpolates between Catalan numbers).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 3
6 5
7 7
8 14
9 21
10 42
11 66
12 132
13 215
14 429
15 715
16 1430
17 2431
18 4862
19 8398
20 16796
21 29393
22 58786
23 104006
24 208012
25 371450
26 742900
27 1337220
28 2674440
29 4847423
30 9694845
31 17678835
32 35357670
33 64822395
34 129644790
35 238819350
36 477638700
37 883631595
38 1767263190
39 3282060210

List of values

[1, 1, 1, 1, 2, 3, 5, 7, 14, 21, 42, 66, 132, 215, 429, 715, 1430, 2431, 4862, 8398, 16796, 29393, 58786, 104006, 208012, 371450, 742900, 1337220, 2674440, 4847423, 9694845, 17678835, 35357670, 64822395, 129644790, 238819350, 477638700, 883631595, 1767263190, 3282060210]

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

Content is available under The OEIS End-User License Agreement.