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!)
A218638 T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nXk array 11
1, 3, 1, 7, 15, 1, 15, 63, 63, 1, 29, 255, 511, 251, 1, 57, 1017, 4095, 4087, 1001, 1, 113, 4065, 32753, 65523, 32689, 4001, 1, 225, 16257, 262017, 1048363, 1048353, 261505, 16001, 1, 449, 65025, 2096129, 16773477, 33546641, 16773633, 2092027, 63985, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Table starts
.1........3...........7.............15...............29................57
.1.......15..........63............255.............1017..............4065
.1.......63.........511...........4095............32753............262017
.1......251........4087..........65523..........1048363..........16773477
.1.....1001.......32689........1048353.........33546641........1073471633
.1.....4001......261505.......16773633.......1073490145.......68702054721
.1....16001.....2092027......268378101......34351677143.....4396930705721
.1....63985....16736081.....4294049121....1099253514899...281403528942981
.1...255867...133887639....68704778799...35176108628465.18009823835462025
.1..1023171..1071093011..1099276346403.1125635352180227
.1..4091495..8568679227.17588419711983
.1.16361227.68548914887
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..1..1..1....0..1..0..0....0..1..1..1....0..0..1..0....1..0..0..0
..1..1..1..1....0..0..1..0....0..1..1..1....1..0..1..1....0..0..0..0
..1..1..0..0....1..0..1..1....1..0..1..1....1..0..1..1....1..1..0..0
CROSSREFS
Column 2 is A218190
Row 1 is A218189
Row 2 is A218236
Row 3 is A218237
Sequence in context: A194595 A219063 A218810 * A232295 A228763 A101845
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Nov 03 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)