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!)
A198639 Number of 2nX4 0..2 arrays with values 0..2 introduced in row major order and each element equal to an even number of horizontal and vertical neighbors 1
36, 2436, 162776, 10937316, 734979136, 49393306556, 3319433387656, 223079838087956, 14991902921730896, 1007518927448282476, 67709509526621985176, 4550363827896811116996, 305803588199889010224736 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A198642
LINKS
FORMULA
Empirical: a(n) = 78*a(n-1) -569*a(n-2) -11744*a(n-3) +71840*a(n-4) +745984*a(n-5) -2507008*a(n-6) -18538496*a(n-7) +36110336*a(n-8) +142606336*a(n-9) -268435456*a(n-10)
EXAMPLE
Some solutions for n=3
..0..1..0..2....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..1..0..1..0....1..0..1..0....1..0..2..0....1..0..1..0....1..0..2..0
..2..1..2..1....2..2..0..1....2..1..0..1....2..1..0..1....2..1..0..1
..1..2..1..2....2..2..1..0....0..2..1..2....1..2..1..0....1..2..1..2
..2..0..2..0....0..1..2..1....2..1..2..0....0..1..0..2....2..1..0..1
..1..2..0..1....1..0..1..0....0..2..1..2....1..0..2..1....1..2..1..2
CROSSREFS
Sequence in context: A230465 A120466 A202633 * A159728 A268365 A004706
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 27 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 20 17:43 EST 2024. Contains 370215 sequences. (Running on oeis4.)