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 A223651 Number of (n+2)X7 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0
 513, 16975, 4854187, 502081983, 47882329200, 4055713784479, 365727640671501, 20518397208263349, 1666402059276661707, 124647566792638712913 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 7 of A223652 LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=3 ..1..1..1..1..1..1..1....1..1..1..1..1..1..1....0..1..0..1..0..0..1 ..0..0..0..0..0..1..0....0..1..0..1..0..1..1....0..1..0..1..0..0..1 ..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..1..0..0..0..0..0 ..0..1..1..0..0..0..1....0..0..0..0..1..0..1....0..0..0..0..0..0..1 ..0..0..0..0..0..0..1....0..0..1..0..0..1..1....1..1..1..0..1..1..1 CROSSREFS Sequence in context: A237620 A111344 A230188 * A353942 A351272 A321565 Adjacent sequences: A223648 A223649 A223650 * A223652 A223653 A223654 KEYWORD nonn AUTHOR R. H. Hardin Mar 25 2013 STATUS approved

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Last modified April 22 18:29 EDT 2024. Contains 371906 sequences. (Running on oeis4.)