login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A306161 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 1
4, 5, 17, 32, 77, 207, 523, 1304, 3307, 8414, 21308, 53961, 136813, 346873, 879204, 2228553, 5649254, 14320348, 36300091, 92016267, 233250975, 591264096, 1498784411, 3799243014, 9630638220, 24412541681, 61882935885, 156866006985 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A306166.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +5*a(n-3) +2*a(n-4) -2*a(n-5) -8*a(n-6) -8*a(n-7) for n>10

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A306166.

Sequence in context: A026678 A026869 A061806 * A119997 A010361 A327683

Adjacent sequences:  A306158 A306159 A306160 * A306162 A306163 A306164

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 23 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 August 3 19:32 EDT 2020. Contains 336201 sequences. (Running on oeis4.)