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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.

A379707 Number of nonempty labeled antichains of subsets of [n] such that all subsets except possibly those of the largest size are disjoint.

Table of values

n a(n)
0 1
1 2
2 5
3 19
4 133
5 2605
6 1128365
7 68731541392
8 1180735736455875189405
9 170141183460507927984536600089529165335
10 7237005577335553223087828975127304180898559033209149835788539833222132944557

List of values

[1, 2, 5, 19, 133, 2605, 1128365, 68731541392, 1180735736455875189405, 170141183460507927984536600089529165335, 7237005577335553223087828975127304180898559033209149835788539833222132944557]

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

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