login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A304298 Number of nX4 0..1 arrays with every element unequal to 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero. 1
2, 1, 5, 4, 13, 30, 43, 129, 245, 519, 1254, 2525, 5707, 12749, 27205, 60962, 133639, 292125, 647249, 1418245, 3119874, 6875729, 15098235, 33237465, 73128441, 160782286, 353832779, 778266279, 1711882901, 3766329669, 8284438272 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304302.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +5*a(n-3) -2*a(n-4) +2*a(n-5) -8*a(n-6) -2*a(n-7) -a(n-8) -4*a(n-9) -a(n-10) -2*a(n-12) -a(n-13) -a(n-14) -a(n-15) for n>19

EXAMPLE

Some solutions for n=5

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

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

..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0

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

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

CROSSREFS

Cf. A304302.

Sequence in context: A120924 A079285 A240607 * A257516 A124660 A217104

Adjacent sequences:  A304295 A304296 A304297 * A304299 A304300 A304301

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 10 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 April 23 23:13 EDT 2019. Contains 322389 sequences. (Running on oeis4.)