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.

A193700 Number of arrays of -6..6 integers x(1..n) with every x(i) in a subsequence of length 1, 2 or 3 with sum zero.

Table of values

n a(n)
1 1
2 13
3 139
4 703
5 5127
6 35121
7 231121
8 1571745
9 10581553
10 71181241
11 479947725
12 3232545773
13 21775125291
14 146700533417
15 988236372613
16 6657360614917
17 44848171247367
18 302123393506887
19 2035285492576987
20 13710906191405879

List of values

[1, 13, 139, 703, 5127, 35121, 231121, 1571745, 10581553, 71181241, 479947725, 3232545773, 21775125291, 146700533417, 988236372613, 6657360614917, 44848171247367, 302123393506887, 2035285492576987, 13710906191405879]

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

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