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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A304014 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero. 1
1, 16, 38, 103, 281, 826, 2421, 7104, 20732, 61087, 179751, 529548, 1561475, 4603482, 13574654, 40041939, 118101915, 348367166, 1027637463, 3031343374, 8942116280, 26378505409, 77814052747, 229545502386, 677142752205, 1997520929872 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A304019.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +4*a(n-2) +3*a(n-3) -13*a(n-4) -20*a(n-5) +6*a(n-6) -21*a(n-7) +23*a(n-8) +63*a(n-9) +36*a(n-10) +14*a(n-11) -55*a(n-12) -43*a(n-13) -7*a(n-14) +26*a(n-15) +25*a(n-16) -6*a(n-17) +4*a(n-18) -4*a(n-20)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304019.

Sequence in context: A070586 A166112 A224738 * A230828 A122030 A122029

Adjacent sequences:  A304011 A304012 A304013 * A304015 A304016 A304017

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 04 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 22 18:53 EDT 2019. Contains 323481 sequences. (Running on oeis4.)