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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A302164 Number of 2Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 4
2, 3, 9, 17, 25, 65, 185, 385, 649, 1489, 3929, 8609, 15913, 34545, 85497, 191809, 377545, 802961, 1894553, 4279521, 8785769, 18612785, 42501945, 95817857, 202153993, 429672401, 960801241, 2153871393, 4621792425, 9879318897 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A302163.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +16*a(n-4) -8*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

CROSSREFS

Cf. A302163.

Sequence in context: A270339 A272057 A056658 * A295965 A034467 A234646

Adjacent sequences:  A302161 A302162 A302163 * A302165 A302166 A302167

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 02 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 March 19 17:21 EDT 2019. Contains 321330 sequences. (Running on oeis4.)