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.

A208653 a(n) = Product_{i=floor((n + 1)/2)..n-1} binomial(n-1, i).

Table of values

n a(n)
1 1
2 1
3 1
4 3
5 4
6 50
7 90
8 5145
9 12544
10 3429216
11 11340000
12 15219319500
13 68309049600
14 457937132487120
15 2790771598030416
16 94609025993497640625
17 783056974947287040000
18 135476575389769051389952000
19 1523136299736565293430210560
20 1354434926051634531310373234715648

List of values

[1, 1, 1, 3, 4, 50, 90, 5145, 12544, 3429216, 11340000, 15219319500, 68309049600, 457937132487120, 2790771598030416, 94609025993497640625, 783056974947287040000, 135476575389769051389952000, 1523136299736565293430210560, 1354434926051634531310373234715648]

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

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