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 A237567 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 9
 81, 316, 316, 1256, 1536, 1256, 4984, 7356, 7356, 4984, 19900, 36168, 44828, 36168, 19900, 78144, 175768, 272828, 272828, 175768, 78144, 311512, 848720, 1668300, 2161168, 1668300, 848720, 311512, 1227648, 4121060, 10006572, 16418704 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .......81.......316........1256.........4984..........19900...........78144 ......316......1536........7356........36168.........175768..........848720 .....1256......7356.......44828.......272828........1668300........10006572 .....4984.....36168......272828......2161168.......16418704.......126608036 ....19900....175768.....1668300.....16418704......159014170......1518590620 ....78144....848720....10006572....126608036.....1518590620.....18615658788 ...311512...4121060....61521086....977290740....14891233160....228407442348 ..1227648..20050460...369916012...7535608804...142803584684...2815624842216 ..4896848..97225972..2269219612..58063606256..1403992115612..34622654326396 .19273664.471641072.13640047444.448289864392.13464379623752.426711928933956 LINKS R. H. Hardin, Table of n, a(n) for n = 1..127 FORMULA Empirical for column k: k=1: a(n) = 4*a(n-2) +140*a(n-4) +632*a(n-6) +864*a(n-8) for n>9 k=2: [order 17] k=3: [order 60] for n>63 EXAMPLE Some solutions for n=3 k=4 ..1..0..0..1..1....0..0..1..0..1....0..2..2..1..2....0..1..1..2..2 ..0..1..0..2..1....0..0..1..1..0....1..2..2..1..0....0..2..0..2..1 ..2..1..0..2..1....1..1..2..2..1....0..1..1..1..0....0..2..1..1..2 ..2..1..2..1..0....0..2..0..0..2....0..1..0..0..0....2..1..0..0..1 CROSSREFS Sequence in context: A237696 A237557 A237550 * A237560 A237332 A237325 Adjacent sequences: A237564 A237565 A237566 * A237568 A237569 A237570 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Feb 09 2014 STATUS approved

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Last modified August 2 19:53 EDT 2024. Contains 374875 sequences. (Running on oeis4.)