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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.

A260331 Labelings of n diamond-shaped posets with 4 vertices per diamond where the labels follow the poset relations.

Table of values

n a(n)
0 1
1 2
2 280
3 277200
4 1009008000
5 9777287520000
6 207786914375040000
7 8508874143657888000000
8 611958228411875304960000000
9 72094798889203029677337600000000
10 13177487340968529764423766528000000000
11 3577714168047637768100581459885056000000000
12 1392303245637418713834022280928868392960000000000

List of values

[1, 2, 280, 277200, 1009008000, 9777287520000, 207786914375040000, 8508874143657888000000, 611958228411875304960000000, 72094798889203029677337600000000, 13177487340968529764423766528000000000, 3577714168047637768100581459885056000000000, 1392303245637418713834022280928868392960000000000]

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

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