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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A183328 T(n,k)=Number of nXk binary arrays with each 1 adjacent to exactly two other 1s 6
 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 4, 1, 1, 6, 10, 10, 6, 1, 1, 9, 19, 27, 19, 9, 1, 1, 13, 37, 72, 72, 37, 13, 1, 1, 19, 69, 179, 289, 179, 69, 19, 1, 1, 28, 129, 447, 996, 996, 447, 129, 28, 1, 1, 41, 244, 1139, 3325, 4740, 3325, 1139, 244, 41, 1, 1, 60, 460, 2912, 11415, 21259 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts .1..1...1....1......1.......1........1.........1..........1...........1 .1..2...3....4......6.......9.......13........19.........28..........41 .1..3...6...10.....19......37.......69.......129........244.........460 .1..4..10...27.....72.....179......447......1139.......2912........7434 .1..6..19...72....289.....996.....3325.....11415......39720......138689 .1..9..37..179....996....4740....21259.....96524.....443793.....2054180 .1.13..69..447...3325...21259...128371....770542....4639132....28160294 .1.19.129.1139..11415...96524...770542...6115158...48449560...386449543 .1.28.244.2912..39720..443793..4639132..48449560..505971397..5319953708 .1.41.460.7434.138689.2054180.28160294.386449543.5319953708.73890230419 LINKS R. H. Hardin, Table of n, a(n) for n = 1..391 EXAMPLE Some solutions for 7X6 ..0..1..1..1..1..1....0..0..1..1..1..0....0..0..1..1..1..1....0..0..1..1..1..0 ..0..1..0..0..0..1....0..1..1..0..1..0....1..1..1..0..0..1....0..0..1..0..1..0 ..0..1..0..1..1..1....1..1..0..0..1..1....1..0..0..0..0..1....1..1..1..0..1..1 ..0..1..0..1..0..0....1..0..0..0..0..1....1..1..0..0..0..1....1..0..0..0..0..1 ..1..1..0..1..1..0....1..0..0..0..1..1....0..1..0..0..0..1....1..1..0..0..0..1 ..1..0..0..0..1..0....1..0..1..1..1..0....0..1..1..1..0..1....0..1..1..0..0..1 ..1..1..1..1..1..0....1..1..1..0..0..0....0..0..0..1..1..1....0..0..1..1..1..1 CROSSREFS Column 2 is A000930(n+1) Sequence in context: A008571 A230860 A051137 * A034328 A034253 A203952 Adjacent sequences: A183325 A183326 A183327 * A183329 A183330 A183331 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jan 03 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 20 08:48 EDT 2024. Contains 373515 sequences. (Running on oeis4.)