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.

A358160 a(n) is the hafnian of the 2n X 2n symmetric matrix defined by M[i,j] = i*j - floor(i*j/3).

Table of values

n a(n)
0 1
1 2
2 40
3 3884
4 1016376
5 534983256
6 510252517152
7 802452895865280
8 1901953775079849600
9 6537796866589765507200
10 31381746234057256630521600

List of values

[1, 2, 40, 3884, 1016376, 534983256, 510252517152, 802452895865280, 1901953775079849600, 6537796866589765507200, 31381746234057256630521600]

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

Content is available under The OEIS End-User License Agreement.