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.

A064139 Sum of divisors of central binomial coefficient binomial(n, floor(n/2)).

Table of values

n a(n)
1 1
2 3
3 4
4 12
5 18
6 42
7 48
8 144
9 312
10 728
11 1152
12 2688
13 4704
14 10080
15 13104
16 39312
17 54432
18 127008
19 181440
20 423360
21 1128960
22 2419200
23 2903040
24 6773760
25 14999040
26 32140800
27 74995200
28 160704000
29 303264000
30 626745600
31 646963200
32 1940889600

List of values

[1, 3, 4, 12, 18, 42, 48, 144, 312, 728, 1152, 2688, 4704, 10080, 13104, 39312, 54432, 127008, 181440, 423360, 1128960, 2419200, 2903040, 6773760, 14999040, 32140800, 74995200, 160704000, 303264000, 626745600, 646963200, 1940889600]

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

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