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!)
A316204 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. 1
4, 23, 78, 271, 982, 3619, 13454, 50193, 187620, 702063, 2628392, 9842791, 36863984, 138074989, 517180630, 1937210511, 7256297572, 27180361021, 101811374934, 381362390785, 1428498083084, 5350835309773, 20043038849204, 75076770609471 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A316209.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +2*a(n-2) -9*a(n-3) -10*a(n-4) +7*a(n-5) +8*a(n-6) -9*a(n-7) -3*a(n-8) +23*a(n-9) +18*a(n-10) -8*a(n-11) -4*a(n-12) +2*a(n-13) -2*a(n-14) -14*a(n-15) -8*a(n-16)
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..1. .0..1..0. .0..0..1. .0..1..1. .0..1..0. .0..1..1
..0..0..0. .0..1..0. .1..1..1. .1..0..0. .0..0..1. .1..1..1. .0..0..1
..1..1..0. .1..1..0. .0..1..1. .0..0..0. .1..1..0. .0..1..1. .0..0..0
..1..0..1. .1..0..0. .1..1..1. .0..0..0. .1..0..0. .1..1..0. .0..0..1
..0..1..0. .1..0..1. .1..0..1. .0..0..0. .0..0..0. .1..1..1. .0..0..0
CROSSREFS
Cf. A316209.
Sequence in context: A071246 A219933 A304305 * A305771 A219465 A317120
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 26 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 21 11:36 EDT 2024. Contains 374472 sequences. (Running on oeis4.)