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.

A333740 Number of inequivalent 2n X 2n binary matrices with rows and columns summing to n, where equivalence means permutations of rows or columns.

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 194
5 601055
6 294494683312
7 14584161564179926207
8 80055722734531008786502722278
9 53505113579082591021525466231199449015539

List of values

[1, 1, 2, 7, 194, 601055, 294494683312, 14584161564179926207, 80055722734531008786502722278, 53505113579082591021525466231199449015539]

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

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