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 A251445 Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having the minimum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
 230, 2429, 26633, 295339, 3275490, 36343085, 403222305, 4473823718, 49637592540, 550735918201, 6110487718079, 67796678363317, 752213181106743, 8345905588826365, 92598935523367524, 1027397539720172063 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A251451 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 9*a(n-1) +34*a(n-2) -100*a(n-3) -243*a(n-4) +272*a(n-5) +534*a(n-6) -258*a(n-7) -265*a(n-8) +231*a(n-9) -151*a(n-10) -110*a(n-11) +234*a(n-12) +2*a(n-13) -65*a(n-14) +20*a(n-15) +a(n-16) -4*a(n-17) +a(n-18) EXAMPLE Some solutions for n=3 ..1..2..1....2..2..1....1..1..1....2..2..0....0..2..2....0..0..2....2..1..1 ..1..2..1....1..1..1....0..1..1....1..1..2....2..1..1....0..2..0....1..0..2 ..1..1..0....2..2..1....1..1..1....1..2..1....0..1..2....2..0..2....1..2..0 ..1..0..2....0..2..1....2..2..1....2..1..1....1..1..2....0..2..2....1..2..2 CROSSREFS Sequence in context: A304389 A211711 A211716 * A251283 A251276 A194490 Adjacent sequences: A251442 A251443 A251444 * A251446 A251447 A251448 KEYWORD nonn AUTHOR R. H. Hardin, Dec 02 2014 STATUS approved

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Last modified December 8 17:58 EST 2023. Contains 367680 sequences. (Running on oeis4.)