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Number of lower triangles of a 6X6 integer array with all row and column sums zero and all row and column sums of squares <= 2n^2
0

%I #4 Mar 31 2012 12:36:25

%S 591,90013,4857647,65530899,584257875,3204150229,15120998539,

%T 54574236425,172034293523,489664849531

%N Number of lower triangles of a 6X6 integer array with all row and column sums zero and all row and column sums of squares <= 2n^2

%C Row 6 of A195892

%e Some solutions for n=4

%e ..0............0............0............0............0............0

%e .-4.4..........2-2..........4-4..........2-2..........2-2..........4-4

%e .-1-1.2.......-1-1.2.......-4.1.3........3.1-4.......-1.0.1.......-2-2.4

%e ..1-3.3-1.....-1.1.1-1......0.1.2-3.....-3-2.4.1......3-2.0-1......1.2-3.0

%e ..1-1-2.0.2....0.3-4-1.2....0.3-2.2-3...-2.1.0-2.3...-3.3.1-2.1...-2.2.0.1-1

%e ..3.1-3.1-2.0..0-1.1.2-2.0..0-1-3.1.3.0..0.2.0.1-3.0.-1.1-2.3-1.0.-1.2-1-1.1.0

%K nonn

%O 1,1

%A _R. H. Hardin_ Sep 24 2011