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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.

A055209 a(n) = Product_{i=0..n} i!^2.

Table of values

n a(n)
0 1
1 1
2 4
3 144
4 82944
5 1194393600
6 619173642240000
7 15728001190723584000000
8 25569049282962188245401600000000
9 3366980847587422591723894776791040000000000
10 44337041641882947649156022595410930014617600000000000000

List of values

[1, 1, 4, 144, 82944, 1194393600, 619173642240000, 15728001190723584000000, 25569049282962188245401600000000, 3366980847587422591723894776791040000000000, 44337041641882947649156022595410930014617600000000000000]

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

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