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!)
A275353 Number of 3Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-2) and new values introduced in order 0..2. 1
5, 54, 288, 1536, 8192, 43712, 235072, 1264832, 6809856, 36666496, 197447168, 1063304448, 5726352128, 30839264512, 166086172928, 894467665408, 4817222467584, 25943536156672, 139721052861440, 752479440667648 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 3 of A275352.
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) -2*a(n-2) -8*a(n-3) +20*a(n-4) -44*a(n-5) -160*a(n-6) -180*a(n-7) +152*a(n-8) -880*a(n-9) -928*a(n-10) +848*a(n-11) +816*a(n-12) +2752*a(n-13) +2880*a(n-14) +2560*a(n-15) -2048*a(n-16) -4096*a(n-18) for n>20
EXAMPLE
Some solutions for n=4
..0..0..0..0. .0..0..0..0. .0..1..0..1. .0..1..0..1. .0..1..0..1
..1..2..1..1. .1..0..1..2. .1..0..2..0. .0..0..1..0. .0..2..1..2
..2..2..2..1. .1..2..2..1. .2..2..0..1. .0..2..2..2. .0..2..2..1
CROSSREFS
Cf. A275352.
Sequence in context: A275396 A275261 A208429 * A221544 A268882 A229298
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 24 2016
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 March 4 02:53 EST 2024. Contains 370522 sequences. (Running on oeis4.)