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.

A145676 Number of n X n {0,-1,1}-matrices A such that permanent( |A| ) = det A, where |A| is obtained from A by taking the absolute value of each entry.

Table of values

n a(n)
0 1
1 2
2 49
3 8419
4 9162049

List of values

[1, 2, 49, 8419, 9162049]

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

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