The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A304672 Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero. 1
1, 13, 23, 56, 199, 598, 1950, 6588, 21871, 72947, 246313, 831539, 2800595, 9456853, 31947922, 107896991, 364471611, 1231447079, 4160781508, 14058449969, 47502997786, 160513512708, 542381014412, 1832740869231, 6192990940151 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 4 of A304676.
LINKS
FORMULA
Empirical recurrence of order 70 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..1..0. .0..1..0..1. .0..0..1..0. .0..1..1..0. .0..0..0..1
..0..1..0..1. .1..0..1..0. .1..1..0..1. .0..1..0..1. .1..1..0..0
..0..1..0..1. .1..1..0..0. .1..1..1..0. .0..0..1..1. .0..1..1..1
..0..0..1..0. .1..0..1..0. .1..1..0..1. .0..1..0..1. .1..1..0..1
..1..0..0..1. .0..1..0..1. .0..0..1..0. .1..0..0..1. .0..0..0..1
CROSSREFS
Cf. A304676.
Sequence in context: A154863 A194156 A139863 * A316119 A046862 A155093
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 16 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 18 23:32 EDT 2024. Contains 373488 sequences. (Running on oeis4.)