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A116527
Number of singular n X n rational {0,1}-matrices with no zero rows or columns and with all rows distinct and all columns distinct, up to permutation of rows.
4
0, 0, 0, 75, 22365, 13303500, 21058940420, 98692672142610
OFFSET
1,4
FORMULA
a(n) = A094000(n) - A088389(n).
Conjecture: a(n) = A000410(n) - A000409(n-1) for n>1. - Jean-François Alcover, Jan 08 2020
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Vladeta Jovovic, Apr 03 2006
STATUS
approved