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.

A200177 Number of -4..4 arrays x(0..n-1) of n elements with zero sum and no two consecutive declines, no adjacent equal elements, and no element more than one greater than the previous (random base sawtooth pattern).

Table of values

n a(n)
1 1
2 4
3 5
4 14
5 24
6 48
7 100
8 280
9 608
10 1094
11 2558
12 6656
13 14475
14 29638
15 69174
16 170043
17 384938
18 830598
19 1910747
20 4608078
21 10600467
22 23514477
23 54265809
24 129118292
25 298774740
26 676277578
27 1564120363
28 3687870415
29 8572421420
30 19643806169

List of values

[1, 4, 5, 14, 24, 48, 100, 280, 608, 1094, 2558, 6656, 14475, 29638, 69174, 170043, 384938, 830598, 1910747, 4608078, 10600467, 23514477, 54265809, 129118292, 298774740, 676277578, 1564120363, 3687870415, 8572421420, 19643806169]