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!)
A301820 Number of nX5 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
3, 18, 74, 299, 1197, 4785, 19130, 76499, 305959, 1223777, 4895020, 19579955, 78319649, 313278369, 1253113182, 5012452355, 20049808955, 80199235249, 320796940304, 1283187760387, 5132751040565, 20531004161105, 82124016643074 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A301823.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -22*a(n-2) +28*a(n-3) -17*a(n-4) +4*a(n-5) for n>7

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301823.

Sequence in context: A280804 A152897 A059393 * A094033 A245580 A043008

Adjacent sequences:  A301817 A301818 A301819 * A301821 A301822 A301823

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 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 April 7 01:03 EDT 2020. Contains 333291 sequences. (Running on oeis4.)