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 A224372 Number of nX6 0..2 arrays with rows unimodal and antidiagonals nondecreasing 1

%I #4 Apr 05 2013 07:10:09

%S 148,4690,80819,1092281,13831334,174854516,2231009824,28645726612,

%T 368818252942,4752723627808,61255849072312,789494767364269,

%U 10175118017926314,131136401564099516,1690070260377561269

%N Number of nX6 0..2 arrays with rows unimodal and antidiagonals nondecreasing

%C Column 6 of A224374

%H R. H. Hardin, <a href="/A224372/b224372.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 28*a(n-1) -283*a(n-2) +1386*a(n-3) -3562*a(n-4) +4940*a(n-5) -3840*a(n-6) -14256*a(n-7) +50007*a(n-8) -26386*a(n-9) +141154*a(n-10) +250789*a(n-11) +41356*a(n-12) +274344*a(n-13) +134400*a(n-14) for n>18

%e Some solutions for n=3

%e ..0..0..0..1..2..1....0..1..1..1..1..1....0..0..0..0..1..2....0..2..0..0..0..0

%e ..2..2..2..2..1..0....2..1..1..1..1..1....1..1..1..2..2..1....2..1..1..0..0..0

%e ..2..2..2..2..2..2....1..1..2..2..1..1....1..1..2..2..2..2....1..1..0..0..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 05 2013

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Last modified September 12 04:22 EDT 2024. Contains 375842 sequences. (Running on oeis4.)