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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.

A200448 Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

Table of values

n a(n)
1 10
2 44
3 144
4 486
5 1582
6 5478
7 18692
8 64782
9 223272
10 776430
11 2701660
12 9439702
13 33021250
14 115801892
15 406698282
16 1430840312
17 5040451088
18 17779563894
19 62784860258
20 221948186878
21 785340477204
22 2781302241584
23 9857972484436

List of values

[10, 44, 144, 486, 1582, 5478, 18692, 64782, 223272, 776430, 2701660, 9439702, 33021250, 115801892, 406698282, 1430840312, 5040451088, 17779563894, 62784860258, 221948186878, 785340477204, 2781302241584, 9857972484436]

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

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