login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A218372 T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..3 nXk array 8
1, 3, 3, 7, 15, 7, 15, 63, 63, 15, 29, 253, 509, 253, 29, 57, 1009, 4081, 4081, 1009, 57, 113, 4033, 32641, 65409, 32641, 4033, 113, 225, 16129, 261121, 1046529, 1046529, 261121, 16129, 225, 449, 64511, 2088955, 16744435, 33488029, 16744435, 2088955 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

....1........3...........7..............15................29

....3.......15..........63.............253..............1009

....7.......63.........509............4081.............32641

...15......253........4081...........65409...........1046529

...29.....1009.......32641.........1046529..........33488029

...57.....4033......261121........16744435........1071613317

..113....16129.....2088955.......267910753.......34291593409

..225....64511....16711551......4286570153.....1097330469185

..449...258015...133691649.....68585092161....35114559214497

..895..1031935..1069527065...1097360991969..1123665390953149

.1783..4127233..8556167553..17557768153359.35957276389513409

.3551.16506913.68448948737.280924166963785

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..127

EXAMPLE

Some solutions for n=3 k=4

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

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

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

CROSSREFS

Column 1 is A218189

Sequence in context: A218233 A218319 A218196 * A218242 A218288 A056420

Adjacent sequences:  A218369 A218370 A218371 * A218373 A218374 A218375

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Oct 27 2012

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 January 24 09:43 EST 2022. Contains 350534 sequences. (Running on oeis4.)