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 A203734 Number of (n+1)X2 0..3 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively 0
 90, 499, 2166, 8667, 31942, 111916, 376415, 1228141, 3911718, 12225055, 37629475, 114415963, 344453875, 1028640925, 3051602949, 9004181108, 26450597561, 77418965194, 225924263865, 657679624225, 1910701827288, 5541861127364 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A203741 LINKS FORMULA Empirical: a(n) = 10*a(n-1) -35*a(n-2) +35*a(n-3) +72*a(n-4) -178*a(n-5) +7*a(n-6) +259*a(n-7) -123*a(n-8) -182*a(n-9) +125*a(n-10) +68*a(n-11) -56*a(n-12) -13*a(n-13) +12*a(n-14) +a(n-15) -a(n-16) EXAMPLE Some solutions for n=4 ..0..3....2..2....0..1....0..2....2..0....1..3....3..3....0..1....1..0....2..0 ..0..3....1..3....0..1....1..3....0..2....1..3....3..3....3..2....0..1....0..2 ..1..2....1..3....1..1....2..2....1..2....3..1....3..3....2..3....0..3....1..1 ..1..3....2..2....3..3....1..3....3..2....1..3....3..3....3..2....1..2....3..3 ..3..3....1..3....3..3....2..2....2..3....1..3....3..3....2..3....1..2....3..3 CROSSREFS Sequence in context: A250870 A284845 A203741 * A066116 A233638 A289792 Adjacent sequences: A203731 A203732 A203733 * A203735 A203736 A203737 KEYWORD nonn AUTHOR R. H. Hardin Jan 05 2012 STATUS approved

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Last modified March 25 00:50 EDT 2023. Contains 361511 sequences. (Running on oeis4.)