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!)
A304013 Number of nX2 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero. 8
1, 7, 16, 45, 120, 333, 928, 2613, 7400, 21053, 60080, 171845, 492280, 1411789, 4051904, 11635413, 33424648, 96042845, 276020944, 793366629, 2280573208, 6556026349, 18847591392, 54185601013, 155783294760, 447882509949 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A304019.

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) -2*a(n-3) -12*a(n-4) -8*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304019.

Sequence in context: A024625 A055553 A066009 * A037241 A154141 A173661

Adjacent sequences:  A304010 A304011 A304012 * A304014 A304015 A304016

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 June 4 07:23 EDT 2020. Contains 334822 sequences. (Running on oeis4.)