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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.

A105974 (A001035(n) - 1)/2 where A001035 is the number of partially ordered sets ("posets") with n labeled elements.

Table of values

n a(n)
0 0
1 0
2 1
3 9
4 109
5 2115
6 65011
7 3064929
8 215861689
9 22255521255
10 3305532624391
11 698140838552949
12 207432475527926749
13 85925364190793529675
14 49242162128564103516091
15 38783585510220344176524969

List of values

[0, 0, 1, 9, 109, 2115, 65011, 3064929, 215861689, 22255521255, 3305532624391, 698140838552949, 207432475527926749, 85925364190793529675, 49242162128564103516091, 38783585510220344176524969]

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

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