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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A304052 Number of nX2 0..1 arrays with every element unequal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 8
1, 3, 11, 10, 51, 165, 306, 993, 2867, 6818, 19499, 54021, 139706, 384617, 1048819, 2792250, 7592483, 20586021, 55352322, 149900145, 405599347, 1094294546, 2959508123, 8001948805, 21614029834, 58429173497, 157940108211, 426779942186 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A304058.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +8*a(n-3) -4*a(n-4) -16*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304058.

Sequence in context: A084409 A038229 A257538 * A303122 A080351 A178709

Adjacent sequences:  A304049 A304050 A304051 * A304053 A304054 A304055

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 05 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 November 24 20:34 EST 2020. Contains 338616 sequences. (Running on oeis4.)