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 A209509 Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences 1
 2187, 53247, 1323270, 33137271, 832374135, 20934997854, 526815563193, 13259938040553, 333783842574072, 8402458085977977, 211521567465170343, 5324833273885068690, 134047481752728606261, 3374518765242613996821 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A209511 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 55*a(n-1) -1109*a(n-2) +11330*a(n-3) -67206*a(n-4) +247404*a(n-5) -582440*a(n-6) +881876*a(n-7) -846764*a(n-8) +499200*a(n-9) -172400*a(n-10) +33152*a(n-11) -3264*a(n-12) +128*a(n-13) EXAMPLE Some solutions for n=4 ..0..2..0..2..0..1..2....1..2..0..1..2..0..1....0..1..0..2..1..2..0 ..1..0..1..0..1..0..1....0..1..2..0..1..2..0....1..0..1..0..2..0..2 ..0..2..0..1..2..1..2....1..0..1..2..0..1..2....2..1..2..1..0..1..0 ..1..0..1..2..0..2..1....2..1..2..0..2..0..1....0..2..0..2..1..2..1 ..2..1..0..1..2..1..2....0..2..0..2..0..2..0....2..0..1..0..2..0..2 CROSSREFS Sequence in context: A233160 A269058 A217970 * A016759 A086874 A183810 Adjacent sequences: A209506 A209507 A209508 * A209510 A209511 A209512 KEYWORD nonn AUTHOR R. H. Hardin Mar 09 2012 STATUS approved

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Last modified April 25 11:24 EDT 2024. Contains 371967 sequences. (Running on oeis4.)