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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.

A200547 Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.

Table of values

n a(n)
1 14
2 76
3 280
4 1240
5 4978
6 21626
7 91058
8 393660
9 1686980
10 7309386
11 31632968
12 137600876
13 599055566
14 2615427970
15 11433493630
16 50075195034
17 219589525108
18 964264276780
19 4238966033150
20 18655002576606
21 82175337524524
22 362306822490256
23 1598684706408864
24 7059561038745824

List of values

[14, 76, 280, 1240, 4978, 21626, 91058, 393660, 1686980, 7309386, 31632968, 137600876, 599055566, 2615427970, 11433493630, 50075195034, 219589525108, 964264276780, 4238966033150, 18655002576606, 82175337524524, 362306822490256, 1598684706408864, 7059561038745824]

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

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