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 A236781 Number of (n+1) X (n+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2 X 2 subblock equal. 0
 81, 1097, 23675, 1287919, 128004881, 32223974061, 13954220420440, 15244019769376849, 29037002912540214181 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A236789. LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for n=3 ..1..2..2..2....1..2..0..1....0..1..1..1....0..1..0..1....0..1..0..1 ..2..1..1..1....2..1..1..2....0..2..1..1....1..1..1..1....1..1..1..2 ..1..2..0..2....0..1..0..1....0..1..1..1....1..0..2..2....2..0..2..1 ..0..1..1..1....1..2..1..1....0..1..2..1....1..2..0..0....1..1..1..2 CROSSREFS Cf. A236789. Sequence in context: A264203 A236047 A264000 * A237059 A236010 A230677 Adjacent sequences: A236778 A236779 A236780 * A236782 A236783 A236784 KEYWORD nonn AUTHOR R. H. Hardin, Jan 31 2014 STATUS approved

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Last modified June 21 05:50 EDT 2024. Contains 373540 sequences. (Running on oeis4.)