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 A253400 Number of (n+1)X(1+1) 0..2 arrays with every 2X2 subblock diagonal maximum plus antidiagonal minimum unequal to its neighbors horizontally, vertically and ne+sw antidiagonally 1
 81, 480, 2890, 17560, 106540, 646240, 3920448, 23781448, 144267352, 875147104, 5308894208, 32204831776, 195362700680, 1185113825256, 7189187420440, 43611271279904, 264556337839152, 1604860554179552, 9735463002163768 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A253407 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +24*a(n-2) +7*a(n-3) -15*a(n-4) -84*a(n-6) -139*a(n-7) -28*a(n-8) -14*a(n-9) -24*a(n-10) for n>11 EXAMPLE Some solutions for n=4 ..2..0....1..0....0..1....0..0....0..2....1..2....0..0....0..0....1..2....2..2 ..0..1....2..0....0..0....1..2....0..0....0..1....2..1....2..1....2..2....2..2 ..2..0....0..1....2..2....0..1....2..1....2..1....0..1....1..1....1..0....0..0 ..1..2....2..0....2..0....2..1....1..0....1..2....2..0....1..1....2..0....2..1 ..2..1....2..2....2..0....2..2....0..2....1..1....2..0....2..2....0..2....2..1 CROSSREFS Sequence in context: A205293 A205286 A253407 * A250620 A237082 A236651 Adjacent sequences:  A253397 A253398 A253399 * A253401 A253402 A253403 KEYWORD nonn AUTHOR R. H. Hardin, Dec 31 2014 STATUS approved

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Last modified July 1 13:12 EDT 2022. Contains 354973 sequences. (Running on oeis4.)