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!)
A305010 Number of nX3 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 1
1, 11, 14, 31, 99, 206, 455, 1321, 3108, 7353, 19511, 48532, 118463, 303897, 765930, 1903657, 4822199, 12178658, 30524501, 77018757, 194412396, 489021459, 1232650101, 3109425604, 7832328261, 19739728551, 49774544636, 125440149679 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A305015.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +13*a(n-3) -9*a(n-4) -37*a(n-5) -59*a(n-6) +27*a(n-7) +130*a(n-8) +92*a(n-9) -35*a(n-10) -129*a(n-11) -8*a(n-12) +78*a(n-13) +45*a(n-14) -53*a(n-15) -34*a(n-16) -24*a(n-17) for n>18

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305015.

Sequence in context: A043105 A043885 A326916 * A195818 A344825 A344842

Adjacent sequences:  A305007 A305008 A305009 * A305011 A305012 A305013

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 23 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 July 26 15:49 EDT 2021. Contains 346294 sequences. (Running on oeis4.)