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!)
A221342 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2 1
7, 137, 2856, 60807, 1299057, 27767394, 593562702, 12688126159, 271223239234, 5797699341153, 123932233563380, 2649188126866350, 56629314186026164, 1210513943745878094, 25876068208481143920, 553129442930337241907 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A221345

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..121

FORMULA

Empirical: a(n) = 43*a(n-1) -604*a(n-2) +3305*a(n-3) -5534*a(n-4) -8103*a(n-5) +18838*a(n-6) +17434*a(n-7) -4723*a(n-8) -11537*a(n-9) -7289*a(n-10) -2900*a(n-11) -652*a(n-12) -296*a(n-13) -94*a(n-14) -16*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A051504 A058881 A100520 * A221298 A009701 A120052

Adjacent sequences:  A221339 A221340 A221341 * A221343 A221344 A221345

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 11 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 June 26 07:35 EDT 2022. Contains 354877 sequences. (Running on oeis4.)