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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.

A199902 Number of -n..n arrays x(0..6) of 7 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

Table of values

n a(n)
1 171
2 1783
3 8823
4 30199
5 82555
6 193689
7 406575
8 783989
9 1413739
10 2414499
11 3942247
12 6197307
13 9431995
14 13958869
15 20159583
16 28494345
17 39511979
18 53860591
19 72298839
20 95707807
21 125103483
22 161649841
23 206672527
24 261673149
25 328344171
26 408584411

List of values

[171, 1783, 8823, 30199, 82555, 193689, 406575, 783989, 1413739, 2414499, 3942247, 6197307, 9431995, 13958869, 20159583, 28494345, 39511979, 53860591, 72298839, 95707807, 125103483, 161649841, 206672527, 261673149, 328344171, 408584411]

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

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