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!)
A317606 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
4, 14, 38, 109, 419, 1413, 4708, 16406, 56424, 192997, 664256, 2285461, 7852493, 26999600, 92853653, 319251681, 1097719967, 3774663142, 12979283717, 44629543176, 153461588223, 527686255393, 1814475510183, 6239176643497 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A317611.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +5*a(n-2) +13*a(n-3) -22*a(n-4) -72*a(n-5) -88*a(n-6) +97*a(n-7) +314*a(n-8) +287*a(n-9) -138*a(n-10) -472*a(n-11) -290*a(n-12) +41*a(n-13) +93*a(n-14) -9*a(n-15) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317611.

Sequence in context: A086954 A111583 A124615 * A114845 A141755 A064463

Adjacent sequences:  A317603 A317604 A317605 * A317607 A317608 A317609

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 01 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 May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)