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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.

A103639 a(n) = Product_{i=1..2*n} (2*i+1).

Table of values

n a(n)
0 1
1 15
2 945
3 135135
4 34459425
5 13749310575
6 7905853580625
7 6190283353629375
8 6332659870762850625
9 8200794532637891559375
10 13113070457687988603440625
11 25373791335626257947657609375
12 58435841445947272053455474390625
13 157952079428395476360490147277859375

List of values

[1, 15, 945, 135135, 34459425, 13749310575, 7905853580625, 6190283353629375, 6332659870762850625, 8200794532637891559375, 13113070457687988603440625, 25373791335626257947657609375, 58435841445947272053455474390625, 157952079428395476360490147277859375]

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

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