A195951 Number of lower triangles of an n X n 0..4 array with no element greater than the number its nonzero horizontal and vertical neighbors

1, 5, 162, 19913, 10408097, 23663085157, 233759541159316, 10022979661615617883, 1865159356600749113021208, 1506395624918723916292924776440, 5280426678910236576404521138602764328

Offset

1,2

Links

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

Example

Some solutions for n=4
..1........1........1........1........1........0........1........1
..1.0......1.0......3.1......1.2......2.2......2.2......2.2......1.1
..2.3.1....1.3.1....2.4.1....2.2.2....1.3.1....2.3.2....1.3.0....3.3.0
..2.3.3.1..2.1.1.1..2.1.3.1..2.3.2.1..2.1.2.0..1.1.2.0..0.2.1.1..2.3.1.1

Crossrefs

Sequence in context: A185832 A301667 A195950 * A128068 A197095 A364117

Adjacent sequences: A195948 A195949 A195950 * A195952 A195953 A195954

Keyword

nonn

Author

R. H. Hardin Sep 25 2011

Status

approved