OFFSET
1,2
COMMENTS
(Empirical) Number of nX4 matrices containing a defective permutation of 1..4*n in strictly increasing order rowwise and columnwise, with one permutation value omitted and one repeated (see example)
Column 4 of A181204
LINKS
R. H. Hardin, Table of n, a(n) for n=1..50
EXAMPLE
Some solutions for 2X4
..1..3..4..5....1..2..4..5....2..4..5..7....1..2..3..4....1..3..4..6
..2..5..7..8....3..5..7..8....3..6..7..8....4..5..6..8....5..6..7..8
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 10 2010
STATUS
approved