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 A237234 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 9
 81, 268, 268, 928, 984, 928, 2784, 3284, 3284, 2784, 9628, 10888, 12014, 10888, 9628, 28912, 36180, 29456, 29456, 36180, 28912, 100008, 120540, 97862, 83436, 97862, 120540, 100008, 300256, 401520, 269844, 233536, 233536, 269844, 401520, 300256 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ......81......268......928.....2784.....9628.....28912....100008.....300256 .....268......984.....3284....10888....36180....120540....401520....1336540 .....928.....3284....12014....29456....97862....269844....926086....2450048 ....2784....10888....29456....83436...233536....671080...1919288....5542856 ....9628....36180....97862...233536...721854...1737372...5299502...12992080 ...28912...120540...269844...671080..1737372...5016852..13078228...34663620 ..100008...401520...926086..1919288..5299502..13078228..42143930...92484308 ..300256..1336540..2450048..5542856.12992080..34663620..92484308..257895268 .1038560..4448892..8256930.15833748.40059070..93075252.270710424..650555580 .3118208.14811704.22301740.45309424.97555340.252437984.638608676.1691829676 LINKS R. H. Hardin, Table of n, a(n) for n = 1..544 FORMULA Empirical for column k: k=1: a(n) = 8*a(n-2) +24*a(n-4) +8*a(n-6) for n>7 k=2: a(n) = a(n-1) +4*a(n-2) +5*a(n-3) +21*a(n-4) +12*a(n-5) +4*a(n-6) for n>8 k=3: a(n) = 5*a(n-2) +42*a(n-4) -21*a(n-6) -207*a(n-8) for n>13 k=4: [order 13] for n>16 k=5: [order 26] for n>29 k=6: [order 34] for n>40 k=7: [order 56] for n>63 EXAMPLE Some solutions for n=4 k=4 ..0..0..1..1..1....2..0..0..2..1....2..1..0..2..1....2..2..1..0..0 ..0..1..2..1..1....1..0..1..2..1....0..0..1..2..2....1..1..0..1..2 ..2..1..1..0..0....0..1..2..1..0....0..1..2..1..0....1..1..1..2..2 ..1..1..1..0..0....2..2..1..0..1....2..2..1..0..1....2..1..1..2..2 ..0..2..2..0..1....1..2..0..0..2....2..1..0..0..2....2..0..0..1..2 CROSSREFS Sequence in context: A237630 A236746 A236739 * A237227 A206094 A202333 Adjacent sequences: A237231 A237232 A237233 * A237235 A237236 A237237 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Feb 05 2014 STATUS approved

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Last modified November 30 06:51 EST 2023. Contains 367454 sequences. (Running on oeis4.)