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!)
A237968 Number of (n+1)X(2+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
1494, 10014, 59014, 357672, 2270776, 14222512, 88114176, 550642732, 3451069630, 21560822458, 134629301012, 841895591970, 5264528244482, 32900378176060, 205627745431856, 1285545369352008, 8036253217579508, 50230256232200120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A237974

LINKS

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

FORMULA

Empirical: a(n) = 84*a(n-3) +773*a(n-4) +1372*a(n-5) +3600*a(n-6) -8931*a(n-7) -55854*a(n-8) -94782*a(n-9) -31846*a(n-10) +191731*a(n-11) +369506*a(n-12) +355656*a(n-13) +149556*a(n-14) +448480*a(n-15) +642040*a(n-16) +99840*a(n-17) for n>20

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A137705 A171617 A067841 * A062912 A328975 A345527

Adjacent sequences:  A237965 A237966 A237967 * A237969 A237970 A237971

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 13 10:40 EDT 2022. Contains 356080 sequences. (Running on oeis4.)