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A202686 T(n,k)=Number of nXk 0..3 arrays with row sums equal and column sums equal 7

%I #5 Mar 31 2012 12:36:50

%S 4,4,4,4,16,4,4,16,16,4,4,96,340,96,4,4,104,832,832,104,4,4,904,6784,

%T 89520,6784,904,4,4,788,224764,389704,389704,224764,788,4,4,10448,

%U 496276,39506424,290838284,39506424,496276,10448,4,4,6280,4373632,235092820

%N T(n,k)=Number of nXk 0..3 arrays with row sums equal and column sums equal

%C Table starts

%C .4......4.........4............4..............4..............4..............4

%C .4.....16........16...........96............104............904............788

%C .4.....16.......340..........832...........6784.........224764.........496276

%C .4.....96.......832........89520.........389704.......39506424......235092820

%C .4....104......6784.......389704......290838284.....1901127404...143872363604

%C .4....904....224764.....39506424.....1901127404.12092687195284.98588916749684

%C .4....788....496276....235092820...143872363604.98588916749684

%C .4..10448...4373632..84143001856.11292985987784

%C .4...6280.231072928.158178730792

%C .4.134716.353406676

%H R. H. Hardin, <a href="/A202686/b202686.txt">Table of n, a(n) for n = 1..83</a>

%e Some solutions for n=4 k=3

%e ..2..2..2....0..1..2....3..0..3....2..1..0....2..2..2....0..3..0....1..2..0

%e ..3..3..0....1..1..1....1..3..2....1..0..2....2..3..1....1..1..1....1..1..1

%e ..3..0..3....2..1..0....3..2..1....0..1..2....3..1..2....1..0..2....1..0..2

%e ..0..3..3....1..1..1....1..3..2....1..2..0....1..2..3....2..0..1....1..1..1

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Dec 22 2011

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Last modified April 23 07:42 EDT 2024. Contains 371905 sequences. (Running on oeis4.)