OFFSET
0,3
COMMENTS
The condition that the columns be in decreasing order is equivalent to considering nonequivalent matrices with distinct columns up to permutation of columns.
EXAMPLE
The a(1) = 1 matrix is:
[1 0 0]
[0 1 0]
[0 0 1]
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jan 25 2020
STATUS
approved