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%I #7 Mar 01 2023 13:19:53
%S 2648,84300,2904651,78133908,2024258650,45232185179,960244682353,
%T 18629377159706,344562315553883,6003667066393097,100443885749557587,
%U 1610133435482186036,24960770149456460632,374598638074715718092
%N Number of (n+1) X (2+1) 0..3 arrays with the sum of each 2 X 2 subblock two median terms lexicographically nondecreasing rowwise and columnwise.
%C Column 2 of A235815.
%H R. H. Hardin, <a href="/A235813/b235813.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2
%e ..0..0..1....3..0..1....0..1..0....2..3..3....1..1..0....0..1..3....0..3..0
%e ..1..1..2....1..0..2....1..0..1....1..1..1....0..3..2....0..1..2....1..1..1
%e ..3..3..1....0..1..2....2..3..2....3..3..1....3..0..3....2..1..1....0..2..1
%Y Cf. A235815.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 16 2014
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