A194790 - OEIS

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A194790

Number of lower triangles of an (n+1)X(n+1) 0..4 array with new values introduced in row major order 0..4 and no element equal to any horizontal, diagonal, antidiagonal or vertical neighbor

1, 9, 252, 11160, 779544, 86082552, 15042748752, 4162973481720, 1825584767007624, 1269014066306135784, 1398647178389920392360, 2444528051373276536144472, 6776054483832917004333974184

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 4 of A194794

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

EXAMPLE

Some solutions for 4X4

..0........0........0........0........0........0........0........0

..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2

..3.0.4....0.3.1....3.0.3....3.4.1....0.3.1....3.4.0....3.0.4....0.3.1