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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.

A099714 Consider the family of directed multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n labeled loops and arcs.

Table of values

n a(n)
0 1
1 2
2 17
3 258
4 5771
5 174528
6 6770119
7 324895980
8 18781627193
9 1281239711000
10 101465766593553
11 9204346831406488
12 945843113150930899
13 109072242262950463552
14 14001689466624210245831
15 1986950788160317182000976
16 309800790825415866952825137
17 52786928631190620809803203872

List of values

[1, 2, 17, 258, 5771, 174528, 6770119, 324895980, 18781627193, 1281239711000, 101465766593553, 9204346831406488, 945843113150930899, 109072242262950463552, 14001689466624210245831, 1986950788160317182000976, 309800790825415866952825137, 52786928631190620809803203872]

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

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