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 A223657 Number of 7Xn 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
 60, 3600, 10425, 1059839, 24559913, 1119629805, 47882329200, 2061491256869, 95329202955957, 6980023496929171, 335311367775542739, 17119067750905601475, 1054799368422675063804, 74856492204365399292957 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 5 of A223652 LINKS Table of n, a(n) for n=1..14. EXAMPLE Some solutions for n=3 ..0..0..1....1..1..1....1..1..1....1..1..1....0..0..1....1..0..1....1..0..1 ..0..0..1....0..0..1....1..0..1....0..0..0....1..0..1....0..0..0....1..1..1 ..0..0..0....0..0..0....0..0..1....1..0..0....1..1..1....0..0..1....0..0..0 ..0..0..0....0..0..1....0..0..0....1..1..1....0..0..1....0..0..1....0..0..0 ..1..0..0....1..0..0....0..0..1....0..0..1....0..0..0....1..0..0....1..0..0 ..1..0..0....0..0..1....0..0..0....1..1..1....0..0..0....0..0..0....0..0..0 ..1..1..1....0..0..0....1..0..1....1..0..1....1..1..1....1..1..1....1..1..1 CROSSREFS Sequence in context: A180373 A264947 A004297 * A264369 A053401 A267930 Adjacent sequences: A223654 A223655 A223656 * A223658 A223659 A223660 KEYWORD nonn AUTHOR R. H. Hardin Mar 25 2013 STATUS approved

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Last modified April 13 15:06 EDT 2024. Contains 371644 sequences. (Running on oeis4.)