

A200770


Number of nX1 0..2 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other


2



3, 3, 2, 7, 9, 6, 22, 30, 20, 75, 105, 70, 266, 378, 252, 966, 1386, 924, 3564, 5148, 3432, 13299, 19305, 12870, 50050, 72930, 48620, 189618, 277134, 184756, 722228, 1058148, 705432, 2762942, 4056234, 2704156, 10608612, 15600900, 10400600, 40859500
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Conjecture: (n+2)*(2270*n4893)*a(n) +3*(1090*n^24919*n+1654)*a(n1) +4686*a(n2) +2*(5540*n^2+7016*n+17127)*a(n3) 6*(1090*n2739)*(2*n7)*a(n4)=0.  R. J. Mathar, Nov 23 2011


EXAMPLE

All solutions for n=4
..0....0....0....0....0....0....0
..0....2....0....1....1....1....2
..1....1....2....2....2....1....1
..2....2....1....2....1....2....1


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



