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 A223159 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit 2
 2218, 55790, 55790, 2077712, 5026270, 2077712, 68181369, 765677906, 765677906, 68181369, 1978616080, 102504263355, 566068245194, 102504263355, 1978616080, 57277247088, 11137517145396, 350946216811545, 350946216811545 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ........2218..........55790.........2077712........68181369.....1978616080 .......55790........5026270.......765677906....102504263355.11137517145396 .....2077712......765677906....566068245194.350946216811545 ....68181369...102504263355.350946216811545 ..1978616080.11137517145396 .57277247088 LINKS R. H. Hardin, Table of n, a(n) for n = 1..22 EXAMPLE Some solutions for n=1 k=4 ..1..2..0..0..1..0....1..2..1..0..0..1....1..1..1..0..3..1....1..0..0..0..2..1 ..0..0..0..0..1..1....0..0..0..0..0..1....0..0..0..0..0..1....0..0..0..0..1..1 ..2..1..2..1..3..3....2..2..1..3..1..2....3..3..1..1..1..2....3..2..1..2..3..3 CROSSREFS Sequence in context: A234867 A234862 A245949 * A223158 A241963 A092992 Adjacent sequences: A223156 A223157 A223158 * A223160 A223161 A223162 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 16 2013 STATUS approved

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Last modified July 16 12:01 EDT 2024. Contains 374348 sequences. (Running on oeis4.)