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!)
A237967 Number of (n+1)X(1+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1494, 7905, 40442, 208210, 1074202, 5540337, 28475040, 146747184, 755218808, 3893371264, 20027524168, 103232219796, 531114565248, 2737826075360, 14084875246240, 72603362037280, 373519603204256, 1925412625288848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237974

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 488*a(n-4) +5140*a(n-6) +14624*a(n-8) +12288*a(n-10) for n>13

EXAMPLE

Some solutions for n=4

..3..0....0..3....2..1....2..1....2..0....3..3....3..2....2..2....3..2....3..0

..2..3....1..3....1..0....0..3....3..2....3..2....3..2....3..1....0..1....0..0

..2..1....2..1....0..0....3..2....3..0....1..1....1..0....0..0....0..2....1..2

..1..0....1..1....2..1....1..2....2..0....0..0....0..3....3..2....0..0....3..1

..2..2....2..3....1..3....1..0....3..3....0..1....0..0....3..0....1..3....0..0

CROSSREFS

Sequence in context: A237143 A333606 A237974 * A237142 A237135 A197709

Adjacent sequences:  A237964 A237965 A237966 * A237968 A237969 A237970

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 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 August 11 12:12 EDT 2022. Contains 356065 sequences. (Running on oeis4.)