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.

A188230 Number of nondecreasing arrangements of n numbers in -(n+1)..(n+1) with sum zero and not more than two numbers equal.

Table of values

n a(n)
1 1
2 4
3 12
4 52
5 221
6 1019
7 4818
8 23522
9 117209
10 594789
11 3062414
12 15966168
13 84132345
14 447457816
15 2399177028
16 12956403904
17 70416558196
18 384897011042
19 2114694606220
20 11672750655842
21 64705139473661
22 360068911514032
23 2010827078176568

List of values

[1, 4, 12, 52, 221, 1019, 4818, 23522, 117209, 594789, 3062414, 15966168, 84132345, 447457816, 2399177028, 12956403904, 70416558196, 384897011042, 2114694606220, 11672750655842, 64705139473661, 360068911514032, 2010827078176568]

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

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