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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.

A273983 a(n) = ((4*n)!! - (4*n-1)!!)/(4*n+1).

Table of values

n a(n)
1 1
2 31
3 2745
4 487935
5 145769625
6 65830256415
7 41892106080825
8 35736278004165375
9 39370290736153001625
10 54420772423242699849375
11 92234193751998833171261625
12 188098544080793843475953349375
13 454418941572893462364414856265625
14 1283429428883663190972186961851609375

List of values

[1, 31, 2745, 487935, 145769625, 65830256415, 41892106080825, 35736278004165375, 39370290736153001625, 54420772423242699849375, 92234193751998833171261625, 188098544080793843475953349375, 454418941572893462364414856265625, 1283429428883663190972186961851609375]

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

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