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!)
A205460 Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor 1
2120, 34792, 597288, 10306944, 177411808, 3053150968, 52550629576, 904498008200, 15568043401040, 267954287846248, 4611981247042176, 79380591266662712, 1366284435462423144, 23516241641189712120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A205466

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) +47*a(n-2) +381*a(n-3) +889*a(n-4) +1738*a(n-5) +1450*a(n-6) -1327*a(n-7) -5850*a(n-8) -6842*a(n-9) -201*a(n-10) +5987*a(n-11) +1609*a(n-12) -3010*a(n-13) +750*a(n-14) +1215*a(n-15) -1779*a(n-16) -1448*a(n-17) +771*a(n-18) +670*a(n-19) -118*a(n-20) -168*a(n-21) +44*a(n-22)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A031544 A205660 A205949 * A263510 A250970 A238035

Adjacent sequences:  A205457 A205458 A205459 * A205461 A205462 A205463

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 27 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 August 9 05:53 EDT 2022. Contains 356016 sequences. (Running on oeis4.)