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.

A193701 Number of arrays of -7..7 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 15
3 183
4 953
5 7799
6 58661
7 416291
8 3109443
9 22837977
10 167468295
11 1233723835
12 9067625183
13 66666846231
14 490306244985
15 3605057176121
16 26508858876345
17 194928358871853
18 1433337703487151
19 10539668947354103
20 77500564655649379

List of values

[1, 15, 183, 953, 7799, 58661, 416291, 3109443, 22837977, 167468295, 1233723835, 9067625183, 66666846231, 490306244985, 3605057176121, 26508858876345, 194928358871853, 1433337703487151, 10539668947354103, 77500564655649379]

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

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