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!)
A304341 Number of nX2 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 8
2, 4, 14, 28, 94, 284, 752, 2244, 6532, 18472, 53680, 155040, 445000, 1285184, 3706032, 10672592, 30778032, 88725600, 255701024, 737147264, 2124889120, 6124798656, 17655444096, 50892739392, 146699089600, 422869223040 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A304347.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304347.

Sequence in context: A283353 A323656 A338740 * A263987 A333710 A295909

Adjacent sequences:  A304338 A304339 A304340 * A304342 A304343 A304344

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 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 October 18 23:44 EDT 2021. Contains 348071 sequences. (Running on oeis4.)