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!)
A240645 Number of nX4 0..1 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..1 introduced in row major order 1
2, 3, 8, 18, 61, 168, 526, 1643, 5524, 18762, 65149, 228440, 807770, 2872483, 10255424, 36709394, 131630309, 472542776, 1697728566, 6102699043, 21944561100, 78928279002, 283926402165, 1021465508456, 3675119389202, 13223276351667 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A240649
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) -5*a(n-2) +4*a(n-3) -3*a(n-4) -49*a(n-5) +10*a(n-6) +15*a(n-7) +45*a(n-8) +124*a(n-9) +131*a(n-10) +301*a(n-11) +18*a(n-12) -615*a(n-13) -201*a(n-14) -1508*a(n-15) -823*a(n-16) -413*a(n-17) -254*a(n-18) +2467*a(n-19) +793*a(n-20) +4516*a(n-21) +1071*a(n-22) +2289*a(n-23) -2289*a(n-25) -1071*a(n-26) -4516*a(n-27) -793*a(n-28) -2467*a(n-29) +254*a(n-30) +413*a(n-31) +823*a(n-32) +1508*a(n-33) +201*a(n-34) +615*a(n-35) -18*a(n-36) -301*a(n-37) -131*a(n-38) -124*a(n-39) -45*a(n-40) -15*a(n-41) -10*a(n-42) +49*a(n-43) +3*a(n-44) -4*a(n-45) +5*a(n-46) -5*a(n-47) +a(n-48)
EXAMPLE
Some solutions for n=4
..0..0..0..1....0..1..0..1....0..1..0..1....0..0..0..1....0..1..1..0
..1..0..1..1....0..1..0..1....0..1..0..1....1..1..1..1....0..0..0..0
..1..1..0..1....0..1..0..1....1..0..1..0....0..1..0..1....0..0..0..0
..1..0..0..0....0..1..0..1....1..0..1..0....0..1..0..1....0..1..1..0
CROSSREFS
Sequence in context: A317722 A113183 A157015 * A273754 A242099 A041205
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2014
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 July 18 01:34 EDT 2024. Contains 374377 sequences. (Running on oeis4.)