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!)
A208441 Number of nX4 0..2 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it 1
24, 646, 17992, 505000, 14204032, 399447742, 11236338658, 316042155314, 8889768939632, 250047696761442, 7033349877043778, 197832631341863860, 5564620617951528490, 156520843068032034106, 4402601032901666925362 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A208445
LINKS
FORMULA
Empirical: a(n) = 22*a(n-1) +232*a(n-2) -2274*a(n-3) +21340*a(n-4) -147601*a(n-5) +623877*a(n-6) -2478495*a(n-7) +7316863*a(n-8) -20304345*a(n-9) +44585841*a(n-10) -86967147*a(n-11) +136172607*a(n-12) -169769685*a(n-13) +156927435*a(n-14) -104021019*a(n-15) +37315604*a(n-16) -12243416*a(n-17) -91497206*a(n-18) +127102756*a(n-19) -195503192*a(n-20) +105015024*a(n-21) -69805280*a(n-22) +74556992*a(n-23) -23342720*a(n-24) +26862336*a(n-25) -18183168*a(n-26) +5672960*a(n-27) -2228224*a(n-28) +786432*a(n-29) -262144*a(n-30)
EXAMPLE
Some solutions for n=4
..2..1..2..1....2..0..1..2....1..2..0..2....1..0..2..0....0..1..2..1
..0..2..1..2....0..2..2..0....2..0..2..0....2..0..0..1....2..2..0..0
..1..2..2..0....2..0..0..1....1..2..1..1....0..1..0..0....0..2..2..0
..0..0..2..2....0..1..2..1....2..0..1..2....2..0..1..0....1..1..0..1
CROSSREFS
Sequence in context: A002553 A006201 A118051 * A231449 A276246 A274957
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 26 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 April 22 12:20 EDT 2024. Contains 371900 sequences. (Running on oeis4.)