A194791 Number of lower triangles of an (n+1)X(n+1) 0..5 array with new values introduced in row major order 0..5 and no element equal to any horizontal, diagonal, antidiagonal or vertical neighbor

1, 10, 942, 267856, 187321720, 320268943536, 1338718951693520, 13681233554467188752, 341845510164048367758144, 20883629381235404306727327808, 3119284181051765188519492660687792

Offset

1,2

Comments

Column 5 of A194794

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

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
..3.4.0....0.3.4....0.3.4....3.4.3....3.4.0....3.4.3....0.3.4....3.4.1
..0.5.3.5..4.5.0.1..4.1.2.1..5.1.5.2..1.2.3.5..0.2.0.1..4.1.5.2..1.0.5.4

Crossrefs

Sequence in context: A297471 A024137 A015008 * A292669 A159869 A006242

Adjacent sequences: A194788 A194789 A194790 * A194792 A194793 A194794

Keyword

nonn

Author

R. H. Hardin Sep 03 2011

Status

approved