A195951 - OEIS

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

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

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