OFFSET
0,2
MAPLE
with(LinearAlgebra):
a:= n-> `if`(n=0, 1, Permanent(Matrix(n, (i, j)-> (i+j)*min(i, j)))):
seq(a(n), n=0..16); # Alois P. Heinz, Nov 14 2016
MATHEMATICA
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 13 2012
EXTENSIONS
a(0)=1 prepended and one more term added by Alois P. Heinz, Nov 14 2016
STATUS
approved