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.

A200187 Number of -3..3 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.

Table of values

n a(n)
1 1
2 6
3 14
4 48
5 144
6 482
7 1534
8 5148
9 16826
10 56918
11 188706
12 642300
13 2149072
14 7348408
15 24749244
16 84919630
17 287439908
18 988917344
19 3360535304
20 11586463472
21 39498606276
22 136421151864
23 466287543690
24 1612808711870
25 5524756100592

List of values

[1, 6, 14, 48, 144, 482, 1534, 5148, 16826, 56918, 188706, 642300, 2149072, 7348408, 24749244, 84919630, 287439908, 988917344, 3360535304, 11586463472, 39498606276, 136421151864, 466287543690, 1612808711870, 5524756100592]

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

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