cp's OEIS Frontend

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.

A029894 Number of directed (or Gale-Ryser) graphical partitions: degree-vector pairs (in-degree, out-degree) for directed graphs (loops allowed) with n vertices; or possible ordered pair (row-sum, column-sum) vectors for a 0-1 matrix.

Table of values

n a(n)
0 1
1 2
2 7
3 34
4 221
5 1736
6 15584
7 153228
8 1611189
9 17826202
10 205282376
11 2441437708
12 29816628471
13 372314544202
14 4737438631001
15 61264426341926
16 803488037899349
17 10668478221202710
18 143203795004873285
19 1940953294927992976
20 26536578116407809962
21 365653739580163294032

List of values

[1, 2, 7, 34, 221, 1736, 15584, 153228, 1611189, 17826202, 205282376, 2441437708, 29816628471, 372314544202, 4737438631001, 61264426341926, 803488037899349, 10668478221202710, 143203795004873285, 1940953294927992976, 26536578116407809962, 365653739580163294032]

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

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