A235543 - OEIS

%I #5 Aug 11 2014 22:46:08

%S 141,1049,8711,61401,429443,2704866,16395328,93093885,508540185,

%T 2659704703,13471014030,66144806353,316636996887,1480951215734,

%U 6789622700273,30573699358527,135511534381407,592152291952613

%N Number of (n+1)X(3+1) 0..1 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing rowwise and columnwise

%C Column 3 of A235548

%H R. H. Hardin, <a href="/A235543/b235543.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A235543/a235543.txt">Empirical recurrence of order 77</a>

%F Empirical recurrence of order 77 (see link above)

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 12 2014