login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A317520 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero. 1
4, 32, 248, 1921, 14892, 115446, 894961, 6937925, 53784248, 416946757, 3232258602, 25057145775, 194248243009, 1505853070853, 11673688450775, 90496878270178, 701550757601700, 5438568433511460, 42160921765806133, 326840297382217310 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A317525.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -2*a(n-2) +a(n-3) -3*a(n-4)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317525.

Sequence in context: A147551 A316803 A299649 * A300203 A273053 A303422

Adjacent sequences:  A317517 A317518 A317519 * A317521 A317522 A317523

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 30 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 August 3 22:03 EDT 2021. Contains 346441 sequences. (Running on oeis4.)