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!)
A305362 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. 1
1, 16, 39, 107, 310, 943, 2935, 9077, 28054, 87562, 272571, 850365, 2654831, 8284969, 25870031, 80782480, 252246425, 787748512, 2460025106, 7682422987, 23991929280, 74925446720, 233989461442, 730741987475, 2282083022643, 7126881707392 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A305367.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +5*a(n-2) +2*a(n-3) -16*a(n-4) -14*a(n-5) -27*a(n-7) +32*a(n-8) +52*a(n-9) +43*a(n-10) +27*a(n-11) -34*a(n-12) -25*a(n-13) -12*a(n-14) +13*a(n-15) +a(n-16) -20*a(n-17) -8*a(n-18)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305367.

Sequence in context: A342976 A347410 A253152 * A197603 A144448 A070584

Adjacent sequences:  A305359 A305360 A305361 * A305363 A305364 A305365

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 23 21:56 EST 2022. Contains 350515 sequences. (Running on oeis4.)