login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A195950 Number of lower triangles of an n X n 0..3 array with no element greater than the number its nonzero horizontal and vertical neighbors 1
1, 5, 162, 17424, 6756437, 9790899054, 53438526965463, 1095434478598715742, 84189100478450762470628, 24264818647445156524051251366, 26234269948355443957604222160170467 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=4

..1........1........1........0........1........1........0........0

..2.1......2.0......3.2......0.1......1.1......3.2......2.2......1.2

..1.2.0....3.3.2....1.3.0....2.1.2....3.2.2....2.1.1....1.1.1....1.1.1

..0.2.1.1..2.1.1.1..2.1.1.0..2.2.1.1..1.3.2.0..1.2.3.1..2.2.2.1..0.2.1.0

CROSSREFS

Sequence in context: A117068 A185832 A301667 * A195951 A128068 A197095

Adjacent sequences:  A195947 A195948 A195949 * A195951 A195952 A195953

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 25 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 20 11:38 EDT 2019. Contains 324234 sequences. (Running on oeis4.)