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 A237465 Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the lower median minus the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one. 1
 81, 356, 1566, 6954, 30913, 136488, 603184, 2671904, 11847888, 52383008, 231824656, 1026098208, 4546286096, 20109616256, 89038511104, 393995791360, 1745176506880, 7720658462720, 34190008144896, 151276942817792 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 288*a(n-4) + 1840*a(n-6) + 784*a(n-8). Empirical g.f.: x*(81 + 356*x + 1566*x^2 + 6954*x^3 + 7585*x^4 + 33960*x^5 + 3136*x^6 + 14112*x^7) / (1 - 288*x^4 - 1840*x^6 - 784*x^8). - Colin Barker, Oct 22 2018 EXAMPLE Some solutions for n=5: ..0..0....0..1....2..0....1..1....2..1....1..1....1..0....2..0....0..1....1..0 ..0..0....2..1....1..1....1..1....1..2....2..2....1..0....0..2....0..0....2..0 ..0..1....0..0....0..1....0..2....0..1....1..2....0..2....1..2....0..0....0..0 ..1..2....2..2....0..1....1..0....0..0....2..0....0..2....1..1....1..2....0..1 ..0..2....1..1....2..2....0..1....0..0....2..0....1..2....2..2....2..2....2..1 ..1..1....0..0....0..0....2..0....2..1....2..1....0..1....0..2....0..1....2..1 CROSSREFS Column 1 of A237472. Sequence in context: A237317 A237723 A237472 * A236997 A236065 A206676 Adjacent sequences: A237462 A237463 A237464 * A237466 A237467 A237468 KEYWORD nonn AUTHOR R. H. Hardin, Feb 08 2014 STATUS approved

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Last modified September 12 02:35 EDT 2024. Contains 375842 sequences. (Running on oeis4.)