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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.

A260332 Labelings of n diamond-shaped posets with 4 vertices per diamond where the labels follow the poset relations whose associated reading permutation avoids 231 in the classical sense.

Table of values

n a(n)
0 1
1 2
2 18
3 226
4 3298
5 52450
6 881970

List of values

[1, 2, 18, 226, 3298, 52450, 881970]

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

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