A188448 - OEIS

%I #7 Mar 31 2012 12:36:12

%S 1,2,0,4,1,0,10,4,0,0,26,18,1,0,0,76,112,10,0,0,0,232,820,112,1,0,0,0,

%T 764,6912,1760,26,0,0,0,0,2620,66178,35150,820,1,0,0,0,0,9496,708256,

%U 848932,35150,76,0,0,0,0,0,35696,8372754,24243520,1944530,6912,1,0,0,0,0

%N T(n,k)=Number of (n*k)Xk binary arrays with nonzero rows in decreasing order, no more than 2 ones in any row and exactly n ones in every column

%C Table starts

%C .1.2.4.10..26...76...232.....764......2620........9496.........35696

%C .0.1.4.18.112..820..6912...66178....708256.....8372754.....108306280

%C .0.0.1.10.112.1760.35150..848932..24243520...805036704...30649435140

%C .0.0.0..1..26..820.35150.1944530.133948836.11234051976.1127512146540

%C .0.0.0..0...1...76..6912..848932.133948836.26615510712

%C .0.0.0..0...0....1...232...66178..24243520

%C .0.0.0..0...0....0.....1.....764

%C .0.0.0..0...0....0.....0

%C .0.0.0..0...0....0

%C .0.0.0..0...0

%H R. H. Hardin, <a href="/A188448/b188448.txt">Table of n, a(n) for n = 1..108</a>

%e All solutions for 9X3

%e ..1..1..0

%e ..1..0..1

%e ..1..0..0

%e ..0..1..1

%e ..0..1..0

%e ..0..0..1

%e ..0..0..0

%e ..0..0..0

%e ..0..0..0

%Y Row 1 is A000085

%Y Row 2 is A000986

%Y Row 3 is A110040

%Y Row 4 is A139670

%Y Row 5 is A139671

%Y Row 6 is A139673

%Y Row 7 is A139674

%Y Row 8 is A139675

%K nonn,tabl

%O 1,2

%A _R. H. Hardin_ Mar 31 2011