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!)
A317006 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero. 1
4, 23, 96, 400, 1704, 7313, 31328, 134118, 574442, 2460748, 10541124, 45155605, 193438738, 828663631, 3549885894, 15207276051, 65146190696, 279078852182, 1195542461428, 5121570860689, 21940242659146, 93989578468682 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A317011.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -7*a(n-3) -27*a(n-4) -5*a(n-5) +14*a(n-6) +78*a(n-7) +49*a(n-8) -46*a(n-9) -81*a(n-10) +5*a(n-11) +55*a(n-12) -2*a(n-13) -39*a(n-14) -30*a(n-15) -8*a(n-16) for n>17

EXAMPLE

Some solutions for n=5

..0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..1. .0..1..0

..1..0..1. .0..0..0. .0..0..1. .0..0..0. .1..0..0. .1..0..0. .1..1..1

..0..0..0. .1..1..0. .1..0..0. .1..0..1. .1..1..0. .1..1..1. .1..0..1

..0..0..0. .1..0..0. .1..1..1. .0..0..0. .1..1..1. .1..1..0. .0..0..0

..0..1..0. .1..0..1. .1..0..1. .0..1..0. .1..1..0. .1..1..1. .0..0..0

CROSSREFS

Cf. A317011.

Sequence in context: A220647 A014585 A305588 * A227260 A316871 A197854

Adjacent sequences:  A317003 A317004 A317005 * A317007 A317008 A317009

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 18 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 22 23:50 EST 2022. Contains 350504 sequences. (Running on oeis4.)