OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..100
EXAMPLE
The a(1) = 3 matrices are:
[1 0] [0 1] [1 1]
[0 1] [1 0]
PROG
(PARI) a(n)={subst(serlaplace(polcoef(polcoef(prod(i=0, n, prod(j=0, n, 1 + x^i*y^j*z + O(x*x^n) + O(y*y^n))), n, x), n, y)/(1 + z)), z, 1)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jan 23 2020
STATUS
approved