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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.

A260579 Labelings of n diamond-shaped posets with 4 vertices per diamond where the labels follow the poset relations whose associated reading permutation avoids 321 in the classical sense.

Table of values

n a(n)
0 1
1 2
2 106
3 5976
4 387564
5 27247446
6 2020632046
7 155622020610
8 12327937844924
9 998103225615208

List of values

[1, 2, 106, 5976, 387564, 27247446, 2020632046, 155622020610, 12327937844924, 998103225615208]

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

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