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.

A200055 Number of -6..6 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing.

Table of values

n a(n)
1 1
2 12
3 78
4 546
5 3914
6 28554
7 211242
8 1577878
9 11867186
10 89815404
11 682642050
12 5211283212
13 39897460856
14 306446600454
15 2358644800468
16 18199380449274
17 140644480480176
18 1089068472750998
19 8443172123261506
20 65564035662489652

List of values

[1, 12, 78, 546, 3914, 28554, 211242, 1577878, 11867186, 89815404, 682642050, 5211283212, 39897460856, 306446600454, 2358644800468, 18199380449274, 140644480480176, 1089068472750998, 8443172123261506, 65564035662489652]

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

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