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!)
A237069 Number of (n+1)X(1+1) 0..3 arrays with the upper median of every 2X2 subblock equal 1
256, 2132, 15882, 128988, 1042300, 8613338, 71747464, 604396964, 5132149170, 43910139636, 378007127116, 3271425891026, 28436225035504, 248077289597684, 2170686359190426, 19040036742791820, 167340548970850396 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237076

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) -80*a(n-2) -614*a(n-3) +3996*a(n-4) +6360*a(n-5) -60341*a(n-6) -25592*a(n-7) +404984*a(n-8) +30176*a(n-9) -1229712*a(n-10) +1327104*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A205466 A205459 A237076 * A346961 A206063 A206056

Adjacent sequences: A237066 A237067 A237068 * A237070 A237071 A237072

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 03 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 January 29 08:01 EST 2023. Contains 359915 sequences. (Running on oeis4.)