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!)
A231694 Number of nX2 0..3 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors 1
4, 28, 272, 1998, 13260, 94996, 691229, 4926082, 35082734, 251198534, 1797886622, 12852933731, 91912956748, 657463618650, 4702487810918, 33632995941197, 240557644773042, 1720590474243847, 12306454228470804, 88021459865552231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A231700

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) -100*a(n-2) +414*a(n-3) -1560*a(n-4) +4300*a(n-5) -7915*a(n-6) +14336*a(n-7) -26218*a(n-8) +36856*a(n-9) -47376*a(n-10) +63903*a(n-11) -72545*a(n-12) +70297*a(n-13) -69546*a(n-14) +62746*a(n-15) -45905*a(n-16) +31530*a(n-17) -23245*a(n-18) +11184*a(n-19) -5796*a(n-20) +2196*a(n-21) -1296*a(n-22)

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A138272 A245060 A191686 * A112915 A129683 A352082

Adjacent sequences:  A231691 A231692 A231693 * A231695 A231696 A231697

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 12 2013

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 May 16 18:07 EDT 2022. Contains 353719 sequences. (Running on oeis4.)