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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.

A356482 a(n) is the hafnian of a symmetric Toeplitz matrix M(2*n) whose first row consists of 2*n, 2*n-1, ..., 1.

Table of values

n a(n)
0 1
1 1
2 16
3 714
4 62528
5 9056720
6 1960138560
7 592615689904
8 238560786221056
9 123358665203311104
10 79683847063011614720

List of values

[1, 1, 16, 714, 62528, 9056720, 1960138560, 592615689904, 238560786221056, 123358665203311104, 79683847063011614720]