Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #5 Mar 31 2012 12:36:02
%S 171,2121,24993,313105,3959747,50512903,646053371,8287005157,
%T 106415024441,1368098434721,17598078326551,226486740265787,
%U 2915699882756875,37545244543350913,483541481413780309
%N Number of (n+1)X3 0..2 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum
%C Column 2 of A185614
%H R. H. Hardin, <a href="/A185611/b185611.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 5X3
%e ..0..2..0....0..2..0....0..0..0....0..2..1....0..0..2....0..2..1....0..2..0
%e ..2..0..0....1..1..1....1..0..1....1..2..2....0..1..0....2..2..1....1..0..1
%e ..2..0..2....1..2..1....1..1..1....0..2..1....0..0..2....1..0..2....2..2..2
%e ..0..2..1....1..1..1....1..1..1....2..2..1....1..0..2....2..1..2....0..1..0
%e ..1..2..0....0..1..0....0..0..0....1..1..2....0..0..2....1..0..2....2..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 31 2011