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 A251114 Number of (n+1) X (1+1) 0..3 arrays with nondecreasing maximum of every two consecutive values in every row and column. 1
 256, 2500, 22500, 173056, 1252161, 8444836, 54700816, 341067024, 2070978064, 12287279104, 71620999641, 411229777984, 2332755256896, 13098246722500, 72927125108644, 403147286646784, 2215320092092969, 12111576087391236 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A251120. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 16*a(n-1) -51*a(n-2) -429*a(n-3) +2765*a(n-4) +2887*a(n-5) -49472*a(n-6) +27551*a(n-7) +474394*a(n-8) -614722*a(n-9) -2782958*a(n-10) +4898822*a(n-11) +10501999*a(n-12) -22329850*a(n-13) -25727935*a(n-14) +64110703*a(n-15) +39685329*a(n-16) -118628973*a(n-17) -34454062*a(n-18) +139468939*a(n-19) +9485400*a(n-20) -98917632*a(n-21) +9240912*a(n-22) +37628064*a(n-23) -8055936*a(n-24) -5645376*a(n-25) +1679616*a(n-26). EXAMPLE Some solutions for n=4 ..0..1....2..2....0..1....0..1....2..0....0..0....2..1....2..0....0..2....2..1 ..2..1....2..2....0..3....3..0....1..3....2..2....0..1....1..0....0..0....3..2 ..2..2....2..0....1..3....3..1....2..3....2..1....2..1....2..0....1..2....3..1 ..3..2....2..3....0..3....2..2....0..0....1..3....3..1....2..2....3..3....1..2 ..3..1....1..1....3..2....3..3....2..3....3..3....2..3....0..2....3..1....3..3 CROSSREFS Cf. A251120. Sequence in context: A236041 A236037 A251120 * A205181 A205277 A205174 Adjacent sequences: A251111 A251112 A251113 * A251115 A251116 A251117 KEYWORD nonn AUTHOR R. H. Hardin, Nov 30 2014 STATUS approved

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Last modified September 8 05:26 EDT 2024. Contains 375751 sequences. (Running on oeis4.)