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.

A067211 Number of n X n 0..3 matrices with all row and column sums equal.

Table of values

n a(n)
0 1
1 4
2 16
3 340
4 89520
5 290838284
6 12092687195284
7 6675338514190905402
8 50327836869668591230004816
9 5292118931181847999077738163123240
10 7888144623867099277720906683959732404332016
11 168815361056027801755263418243053345902341535059333028

List of values

[1, 4, 16, 340, 89520, 290838284, 12092687195284, 6675338514190905402, 50327836869668591230004816, 5292118931181847999077738163123240, 7888144623867099277720906683959732404332016, 168815361056027801755263418243053345902341535059333028]

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

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