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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.

A378060 a(n) = binomial(n, floor((n-1)/2))^2.

Table of values

n a(n)
0 0
1 1
2 1
3 9
4 16
5 100
6 225
7 1225
8 3136
9 15876
10 44100
11 213444
12 627264
13 2944656
14 9018009
15 41409225
16 130873600
17 590976100
18 1914762564
19 8533694884
20 28210561600
21 124408576656
22 418151049316
23 1828114918084
24 6230734868736
25 27043120090000
26 93271169290000
27 402335398890000

List of values

[0, 1, 1, 9, 16, 100, 225, 1225, 3136, 15876, 44100, 213444, 627264, 2944656, 9018009, 41409225, 130873600, 590976100, 1914762564, 8533694884, 28210561600, 124408576656, 418151049316, 1828114918084, 6230734868736, 27043120090000, 93271169290000, 402335398890000]

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

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