A186913 - OEIS

%I #9 Oct 03 2025 03:47:53

%S 44902749582723,13921822487031205,2169936652932512523,

%T 219019175194540430058,15954040054059557650482,

%U 893383694291331850798966,40128119810449322920431346,1491377073810394581396929600

%N Number of (n+2)X9 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

%C Column 7 of A186915

%H R. H. Hardin, <a href="/A186913/b186913.txt">Table of n, a(n) for n = 1..9</a>

%e Some solutions for 4X9

%e ..0..0..0..0..0..0..0..0..6....0..0..0..0..0..0..0..0..5

%e ..0..0..0..0..0..0..0..2..3....0..0..0..0..0..0..0..0..5

%e ..0..0..0..0..0..0..0..4..2....0..0..0..0..0..0..0..1..1

%e ..0..0..0..0..0..0..0..5..2....0..0..0..0..0..0..0..1..6

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 28 2011