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 A250530 Number of (n+1)X(2+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 1
 700, 6012, 44017, 289035, 1767743, 10248336, 57297797, 311492811, 1660155153, 8712978900, 45218940684, 232652531053, 1189341514559, 6050012100793, 30661998107606, 154958014837147, 781456621840360, 3934524933037624 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A250536 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 19*a(n-1) -126*a(n-2) +183*a(n-3) +1796*a(n-4) -8913*a(n-5) +4573*a(n-6) +66844*a(n-7) -159500*a(n-8) -110347*a(n-9) +880170*a(n-10) -671453*a(n-11) -2023137*a(n-12) +3717534*a(n-13) +1245646*a(n-14) -7902628*a(n-15) +3640217*a(n-16) +8175766*a(n-17) -8942921*a(n-18) -2871444*a(n-19) +8558015*a(n-20) -2088628*a(n-21) -3791479*a(n-22) +2465772*a(n-23) +449922*a(n-24) -865945*a(n-25) +183465*a(n-26) +86000*a(n-27) -45400*a(n-28) +6000*a(n-29) EXAMPLE Some solutions for n=3 ..1..0..0....1..1..1....0..0..2....0..1..1....1..1..3....0..0..1....1..1..3 ..0..1..3....0..1..2....0..1..3....0..1..2....0..1..3....0..2..2....1..1..3 ..1..3..3....0..2..3....0..3..1....2..1..2....1..1..3....1..3..3....3..3..3 ..3..2..3....3..3..2....3..1..3....1..3..2....1..3..1....0..3..3....3..3..3 CROSSREFS Sequence in context: A293203 A157366 A293279 * A200169 A093270 A093235 Adjacent sequences: A250527 A250528 A250529 * A250531 A250532 A250533 KEYWORD nonn AUTHOR R. H. Hardin, Nov 24 2014 STATUS approved

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Last modified December 2 21:21 EST 2023. Contains 367526 sequences. (Running on oeis4.)