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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.

A200548 Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.

Table of values

n a(n)
1 30
2 200
3 1184
4 7254
5 43698
6 266812
7 1639804
8 10152636
9 63132188
10 394016210
11 2466471522
12 15481097890
13 97396742734
14 614019893832
15 3878005568152
16 24532092598782
17 155413031752230
18 985836563404470
19 6260856742508844

List of values

[30, 200, 1184, 7254, 43698, 266812, 1639804, 10152636, 63132188, 394016210, 2466471522, 15481097890, 97396742734, 614019893832, 3878005568152, 24532092598782, 155413031752230, 985836563404470, 6260856742508844]

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

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