The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #16 Mar 18 2024 10:36:37
%S 1,3,5,7,85,556,1260,27008,215577,613916,16442049,152673459,487975060,
%T 14392411292,144918917509,496264541787,15559415313705,165127072154120,
%U 592098075114238,19339952787547252,212870280758956694,788675446037414831,26535438036570486429,300014957716483809886
%N Number of n X n 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
%e Some solutions for n=5
%e ..0..0..0..0..2....0..0..0..0..2....0..0..0..0..0....0..0..0..0..0
%e ..0..0..1..2..2....0..0..1..1..2....0..0..0..1..1....0..0..1..2..2
%e ..0..1..1..2..2....0..1..1..2..2....1..1..1..1..1....0..1..1..2..2
%e ..0..1..1..2..2....0..1..1..2..2....1..2..2..2..2....1..1..1..2..2
%e ..1..1..1..2..2....1..1..1..2..2....2..2..2..2..2....1..1..1..2..2
%Y Main diagonal of A201277.
%K nonn
%O 0,2
%A _R. H. Hardin_, Nov 29 2011
%E a(0)=1 prepended and a(19)-a(23) added by _Alois P. Heinz_, Mar 17 2024