OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..23 (terms n=1..22 from Herman Jamke)
Wikipedia, Permanent (mathematics)
MAPLE
a:= n-> `if`(n=0, 1, LinearAlgebra[Permanent](
Matrix(n, (i, j)-> 1+irem(j+i, n)))):
seq(a(n), n=0..17); # Alois P. Heinz, Apr 28 2020
PROG
(PARI) permRWNb(a)=n=matsize(a)[1]; if(n==1, return(a[1, 1])); sg=1; in=vectorv(n); x=in; x=a[, n]-sum(j=1, n, a[, j])/2; p=prod(i=1, n, x[i]); for(k=1, 2^(n-1)-1, sg=-sg; j=valuation(k, 2)+1; z=1-2*in[j]; in[j]+=z; x+=z*a[, j]; p+=prod(i=1, n, x[i], sg)); return(2*(2*(n%2)-1)*p)
for(n=1, 22, a=matrix(n, n, i, j, 1+(j-i)%n); print1(permRWNb(a)", ")) \\ Herman Jamke (hermanjamke(AT)fastmail.fm), May 13 2007
(Sage) def A085719(n) : return matrix([[(i-j)%n+1 for j in range(n)] for i in range(n)]).permanent() # Eric M. Schmidt, May 04 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Jul 19 2003
EXTENSIONS
More terms from Vladeta Jovovic, Jul 21 2003
a(0)=1 prepended by Alois P. Heinz, Apr 28 2020
STATUS
approved