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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.

A304919 Number of labeled hyperforests spanning {1,...,n} and allowing singleton edges.

Table of values

n a(n)
0 1
1 1
2 5
3 45
4 665
5 14153
6 399421
7 14137301
8 603647601
9 30231588689
10 1738713049013
11 112976375651901
12 8186616300733321
13 654642360222892057
14 57267075701210437229
15 5440407421313402397541
16 557802495215406348358113
17 61393838258161429159571873
18 7220049654850517272144419941
19 903546142463635579042416518989

List of values

[1, 1, 5, 45, 665, 14153, 399421, 14137301, 603647601, 30231588689, 1738713049013, 112976375651901, 8186616300733321, 654642360222892057, 57267075701210437229, 5440407421313402397541, 557802495215406348358113, 61393838258161429159571873, 7220049654850517272144419941, 903546142463635579042416518989]

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

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