A194537 - OEIS

A194537

Number of lower triangles of an n X n 0..5 array with new values introduced in row major order 0..5 and no element equal to more than one horizontal or vertical neighbor

%I #5 Dec 18 2015 18:17:44

%S 1,4,132,62038,286773762,8096809998526,1243336605965267360,

%T 1026437889413641002431445

%N Number of lower triangles of an n X n 0..5 array with new values introduced in row major order 0..5 and no element equal to more than one horizontal or vertical neighbor

%C Column 5 of A194540

%e Some solutions for 3X3

%e ..0......0......0......0......0......0......0......0......0......0......0

%e ..1.2....1.2....1.2....1.2....1.2....1.2....0.1....1.0....1.1....0.1....0.1

%e ..2.0.3..0.2.1..3.1.1..3.2.1..3.0.1..3.4.1..1.0.1..2.0.1..0.0.2..1.0.2..1.0.0

%K nonn

%O 1,2

%A _R. H. Hardin_ Aug 28 2011