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.

A333164 Number of 2n X 2n symmetric matrices with entries in {+1, -1} and all rows and columns summing to zero.

Table of values

n a(n)
0 1
1 2
2 18
3 1760
4 1944530
5 26615510712
6 4762109992158288
7 11528251571501588791296
8 386860001875783390762182911250
9 183238648400953515891207813311894423000
10 1242327573587456839123512395835593196519781229768
11 121917941188016997420391711911475819481799846311888884541952

List of values

[1, 2, 18, 1760, 1944530, 26615510712, 4762109992158288, 11528251571501588791296, 386860001875783390762182911250, 183238648400953515891207813311894423000, 1242327573587456839123512395835593196519781229768, 121917941188016997420391711911475819481799846311888884541952]

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

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