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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.

A028666 a(n) = order of the orthogonal group O_n(2) if n is odd or O^(+)_n(2) if n is even.

Table of values

n a(n)
0 1
1 12
2 2880
3 11612160
4 758041804800
5 794088208701849600
6 13319336815141167562752000
7 3575164027575627746190393606144000
8 15354978274323252140217954794120612413440000
9 1055182047088717407398960909148529544369642384916480000
10 1160183823755957350394353874696058298158177597536388268425216000000

List of values

[1, 12, 2880, 11612160, 758041804800, 794088208701849600, 13319336815141167562752000, 3575164027575627746190393606144000, 15354978274323252140217954794120612413440000, 1055182047088717407398960909148529544369642384916480000, 1160183823755957350394353874696058298158177597536388268425216000000]

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

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