A205207 - OEIS

%I #5 Mar 31 2012 12:37:05

%S 81,3248,357812,155765726,209120030041,1034393632508251,

%T 14824580873279399161,797526323055787605352015,

%U 123972751506684583828633136175,70684339957802747710060180358201899

%N Number of (n+1)X(n+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards

%C Diagonal of A205215

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 23 2012