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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.

A022016 Number of partially ordered sets with no isolated points and with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.

Table of values

n a(n)
0 1
1 1
2 4
3 12
4 47
5 174
6 749
7 3291
8 15675
9 78104
10 411042
11 2261961
12 13009112
13 77860234

List of values

[1, 1, 4, 12, 47, 174, 749, 3291, 15675, 78104, 411042, 2261961, 13009112, 77860234]

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

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