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!)
A300110 Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
1, 7, 15, 29, 63, 199, 629, 1837, 5397, 15855, 46857, 139131, 411859, 1218209, 3604353, 10667225, 31574175, 93448425, 276561899, 818499247, 2422423269, 7169412933, 21218549729, 62798160031, 185856754621, 550059982899 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A300115.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -7*a(n-2) +4*a(n-3) -4*a(n-4) +7*a(n-5) -26*a(n-6) +26*a(n-7) +17*a(n-8) -5*a(n-9) -a(n-10) -40*a(n-11) +22*a(n-12) -11*a(n-13) +14*a(n-14) +2*a(n-15) -2*a(n-16) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300115.

Sequence in context: A298391 A299509 A299309 * A139597 A210675 A293361

Adjacent sequences:  A300107 A300108 A300109 * A300111 A300112 A300113

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 25 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 October 1 14:10 EDT 2022. Contains 357149 sequences. (Running on oeis4.)