login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A305764 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero. 1
4, 30, 141, 684, 3282, 15874, 76613, 370087, 1787161, 8631009, 41682223, 201299206, 972149367, 4694874104, 22673308188, 109497913757, 528806506293, 2553805037346, 12333282715847, 59562049771856, 287647486358008 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A305769.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +9*a(n-2) -6*a(n-4) +12*a(n-5) -3*a(n-6) -27*a(n-7) +17*a(n-8) -4*a(n-9) -7*a(n-10) +a(n-11)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305769.

Sequence in context: A005715 A281950 A316178 * A317113 A123351 A305525

Adjacent sequences:  A305761 A305762 A305763 * A305765 A305766 A305767

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 10 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 April 25 18:12 EDT 2019. Contains 322461 sequences. (Running on oeis4.)