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.

A229865 Number of n X n 0..1 arrays with corresponding row and column sums equal.

Table of values

n a(n)
0 1
1 2
2 8
3 80
4 2432
5 247552
6 88060928
7 112371410944
8 523858015518720
9 9041009511609073664
10 583447777113052431515648
11 141885584718620229407228821504
12 130832005909904417592540055577034752
13 459749137931232137234615429529864283095040
14 6182706200522446492946534924719926752508110700544

List of values

[1, 2, 8, 80, 2432, 247552, 88060928, 112371410944, 523858015518720, 9041009511609073664, 583447777113052431515648, 141885584718620229407228821504, 130832005909904417592540055577034752, 459749137931232137234615429529864283095040, 6182706200522446492946534924719926752508110700544]

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

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