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 A223194 Number of nX7 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0
 1143, 1306449, 52906752, 76015542500, 49198404222036, 36214510060655577, 36869649918720635277 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 7 of A223195 LINKS EXAMPLE Some solutions for n=3 ..0..0..0..2..0..1..2....0..0..0..1..2..2..2....0..0..1..0..2..2..2 ..0..0..0..1..0..1..1....0..0..0..0..1..1..2....0..0..0..0..0..1..0 ..2..0..0..2..0..2..1....0..0..0..0..1..1..2....2..0..0..2..0..2..0 CROSSREFS Sequence in context: A252428 A251773 A116174 * A110731 A265504 A237458 Adjacent sequences:  A223191 A223192 A223193 * A223195 A223196 A223197 KEYWORD nonn AUTHOR R. H. Hardin Mar 18 2013 STATUS approved

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Last modified July 23 22:49 EDT 2019. Contains 325278 sequences. (Running on oeis4.)