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.

A201806 Number of arrays of n integers in -3..3 with sum zero and equal numbers of elements greater than zero and less than zero.

Table of values

n a(n)
1 1
2 7
3 19
4 151
5 631
6 4621
7 23857
8 164599
9 948871
10 6359617
11 38944357
12 258107389
13 1636264813
14 10819063087
15 70033892299
16 463844386999
17 3042796871863
18 20218887555601
19 133836585431269
20 892623030133681
21 5947033694372881

List of values

[1, 7, 19, 151, 631, 4621, 23857, 164599, 948871, 6359617, 38944357, 258107389, 1636264813, 10819063087, 70033892299, 463844386999, 3042796871863, 20218887555601, 133836585431269, 892623030133681, 5947033694372881]

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

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