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!)
A302076 Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
3, 10, 33, 115, 386, 1323, 4485, 15290, 51977, 176947, 601946, 2048483, 6969893, 23717058, 80700241, 274599219, 934369138, 3179364635, 10818345477, 36811374474, 125257251353, 426210254579, 1450256511946, 4934757299411 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A302081.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +7*a(n-2) +4*a(n-3)
EXAMPLE
Some solutions for n=5
..0..0..1. .0..1..1. .0..1..1. .0..1..0. .0..0..0. .0..0..0. .0..0..1
..1..0..0. .0..0..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0. .1..1..1
..1..1..0. .1..0..1. .0..1..1. .0..1..1. .0..1..1. .1..0..1. .1..0..1
..0..1..0. .0..1..0. .0..0..1. .0..0..1. .0..0..1. .1..0..1. .1..1..1
..0..0..0. .0..0..0. .1..0..1. .1..0..1. .1..0..0. .1..0..1. .1..0..0
CROSSREFS
Cf. A302081.
Sequence in context: A001558 A304824 A111639 * A149029 A149030 A024426
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 31 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 May 20 03:01 EDT 2024. Contains 372703 sequences. (Running on oeis4.)