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A235408 Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise 1

%I

%S 121,704,4256,20398,98575,397340,1623115,5744912,20612708,65877470,

%T 213190201,627225413,1867007833,5131067959,14261504547,37041121138,

%U 97280493869,241057367009,603912355679,1438964930953,3465601783227

%N Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise

%C Column 3 of A235413

%H R. H. Hardin, <a href="/A235408/b235408.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A235408/a235408.txt">Empirical recurrence of order 73</a>

%F Empirical recurrence of order 73 (see link above)

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 10 2014

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Last modified August 21 05:48 EDT 2019. Contains 326162 sequences. (Running on oeis4.)