A181274 - OEIS

%I #3 Mar 31 2012 12:35:50

%S 2,4,0,8,3,0,16,11,0,0,32,48,9,0,0,64,188,79,0,0,0,128,768,766,58,0,0,

%T 0,256,3056,6060,1629,13,0,0,0,512,12288,49928,28924,1991,3,0,0,0,

%U 1024,49088,395024,507052,87873,1420,0,0,0,0,2048,196608,3170784,8211776

%N T(n,k)=Number of nXk binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly decreasing order

%C Table starts

%C .2.4..8.16...32.....64.......128........256.........512.........1024

%C .0.3.11.48..188....768......3056......12288.......49088.......196608

%C .0.0..9.79..766...6060.....49928.....395024.....3170784.....25244608

%C .0.0..0.58.1629..28924....507052....8211776...133693904...2140571200

%C .0.0..0.13.1991..87873...3409059..115127924..3829185508.123796928928

%C .0.0..0..3.1420.177193..15691171.1126220822.76961864884.............

%C .0.0..0..0..592.233363..50841045.7892201343.........................

%C .0.0..0..0..120.205181.118451006....................................

%C .0.0..0..0...11.123441..............................................

%C .0.0..0..0....0.....................................................

%H R. H. Hardin, <a href="/A181274/b181274.txt">Table of n, a(n) for n=1..108</a>

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Oct 10 2010