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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.

A305004 Number of labeled hypertrees (connected acyclic antichains) spanning some subset of {1,...,n} without singleton edges.

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 52
5 507
6 6844
7 118582
8 2504856
9 62370530
10 1788082154
11 57997339633
12 2099638691440
13 83922479506504
14 3670657248913386
15 174387350448735878
16 8942472292255441104
17 492294103555090048459
18 28958704109012732921524

List of values

[1, 1, 2, 8, 52, 507, 6844, 118582, 2504856, 62370530, 1788082154, 57997339633, 2099638691440, 83922479506504, 3670657248913386, 174387350448735878, 8942472292255441104, 492294103555090048459, 28958704109012732921524]

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

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