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A202734 Number of nX7 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to min(n,7)-1 1

%I #5 Mar 31 2012 12:36:51

%S 1,32,2062,184848,12219684,182593546,51871384,4025241096124,

%T 36422682546205910,131056226079716655758,280757551199231043765836,

%U 441077319990976298095629110,574350179584926874304293083870

%N Number of nX7 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to min(n,7)-1

%C Column 7 of A202735

%H R. H. Hardin, <a href="/A202734/b202734.txt">Table of n, a(n) for n = 1..87</a>

%e Some solutions for n=4

%e ..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0

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

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

%e ..0..1..0..0..2..2..3....0..1..0..0..0..2..3....0..1..0..1..1..0..3

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 23 2011

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Last modified May 9 18:53 EDT 2024. Contains 372354 sequences. (Running on oeis4.)