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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.

A361749 a(n) is the number of n X n matrices with nonnegative integer entries, row sums 1,2,...,n and column sums 1,2,...,n.

Table of values

n a(n)
0 1
1 1
2 2
3 12
4 261
5 22645
6 8264346
7 13150070522
8 93589674933872
9 3036609755945925595
10 455845471095088280120142
11 320342093420041869298750385976
12 1063978124653925432733949863518874116
13 16835366182312565093823092118182447742597067

List of values

[1, 1, 2, 12, 261, 22645, 8264346, 13150070522, 93589674933872, 3036609755945925595, 455845471095088280120142, 320342093420041869298750385976, 1063978124653925432733949863518874116, 16835366182312565093823092118182447742597067]

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

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