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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A186163 1/4 the number of nX4 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 1
 4, 321, 14364, 751266, 37402872, 1899336597, 95752776009, 4840082975532, 244420512852030, 12347377339339755, 623671780419814416, 31503432697236966789, 1591300459563274835532, 80380228276030331585859 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A186168 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 EXAMPLE Some solutions for 6X4 with a(1,1)=0 ..0..0..0..1....0..0..2..2....0..0..0..3....0..0..1..1....0..0..3..3 ..0..2..2..1....0..2..2..1....0..2..2..3....0..2..2..1....0..2..2..2 ..0..0..2..3....0..0..1..1....0..0..3..0....0..0..1..1....0..0..3..1 ..2..0..0..3....2..0..2..2....2..0..3..0....2..0..3..3....2..0..3..1 ..2..2..0..0....2..3..3..1....2..2..2..0....2..2..2..2....2..0..2..2 ..0..0..2..2....0..0..0..1....0..0..1..1....0..0..1..1....2..2..0..0 CROSSREFS Sequence in context: A227673 A203479 A034226 * A159492 A053917 A005832 Adjacent sequences: A186160 A186161 A186162 * A186164 A186165 A186166 KEYWORD nonn AUTHOR R. H. Hardin Feb 13 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 9 23:59 EDT 2023. Contains 363183 sequences. (Running on oeis4.)