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!)
A302368 Number of 2Xn 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 4
2, 2, 12, 20, 72, 168, 496, 1296, 3616, 9760, 26816, 73024, 199808, 545408, 1490688, 4071680, 11125248, 30392832, 83037184, 226857984, 619792384, 1693296640, 4626182144, 12638949376, 34530271232, 94338424832, 257737408512 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 2 of A302367.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +4*a(n-2) -4*a(n-3) -4*a(n-4)
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..0..0..1. .0..1..1..1..0. .0..0..1..0..1
..0..1..0..1..0. .1..0..1..0..0. .1..1..0..1..1. .0..0..0..0..0
CROSSREFS
Cf. A302367.
Sequence in context: A265458 A054916 A194767 * A346757 A202669 A178845
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 06 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 July 25 01:41 EDT 2024. Contains 374585 sequences. (Running on oeis4.)