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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.

A199900 Number of -n..n arrays x(0..4) of 5 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

Table of values

n a(n)
1 33
2 159
3 461
4 1043
5 2031
6 3573
7 5839
8 9021
9 13333
10 19011
11 26313
12 35519
13 46931
14 60873
15 77691
16 97753
17 121449
18 149191
19 181413
20 218571
21 261143
22 309629
23 364551
24 426453
25 495901
26 573483
27 659809
28 755511
29 861243
30 977681
31 1105523
32 1245489
33 1398321

List of values

[33, 159, 461, 1043, 2031, 3573, 5839, 9021, 13333, 19011, 26313, 35519, 46931, 60873, 77691, 97753, 121449, 149191, 181413, 218571, 261143, 309629, 364551, 426453, 495901, 573483, 659809, 755511, 861243, 977681, 1105523, 1245489, 1398321]

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

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