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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.

A346162 a(n) = (-1)^n*permanent[tan(Pi*(j+k)/(2n+1))]_{1<=j,k<=2n}.

Table of values

n a(n)
1 3
2 65
3 1995
4 149121
5 13399155
6 2141638785
7 387394882875
8 107278565018625
9 32598647029023075
10 13887464253877202625
11 6371929420307657080875
12 3868428575833744110890625
13 2498109253610200166983921875
14 2048940276336573213783855290625
15 1771722889715428355094671454046875
16 1887395844638188493284600904244890625

List of values

[3, 65, 1995, 149121, 13399155, 2141638785, 387394882875, 107278565018625, 32598647029023075, 13887464253877202625, 6371929420307657080875, 3868428575833744110890625, 2498109253610200166983921875, 2048940276336573213783855290625, 1771722889715428355094671454046875, 1887395844638188493284600904244890625]

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

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