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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A280856 Number of nX5 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards. 1
30, 442, 256, 216, 282, 491, 968, 1857, 3220, 5281, 8574, 14339, 24694, 42833, 73650, 125361, 212438, 360727, 614668, 1049609, 1791800, 3055487, 5205640, 8868669, 15113516, 25765385, 43926544, 74885231, 127643494, 217567203, 370837946 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A280859.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) -a(n-3) +2*a(n-4) -a(n-5) +4*a(n-6) -a(n-7) -a(n-8) -2*a(n-9) -3*a(n-12) for n>18

EXAMPLE

Some solutions for n=4

..0..0..1..1..0. .0..1..1..2..1. .0..1..0..1..1. .0..1..0..0..1

..1..2..2..0..2. .2..2..0..0..1. .0..2..0..2..0. .2..1..2..1..2

..1..0..1..1..2. .0..1..1..2..2. .1..2..1..1..0. .0..0..2..0..2

..0..2..2..0..0. .2..2..0..0..1. .1..0..0..2..2. .2..1..1..0..1

CROSSREFS

Cf. A280859.

Sequence in context: A125465 A215193 A163130 * A281602 A307917 A006421

Adjacent sequences:  A280853 A280854 A280855 * A280857 A280858 A280859

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2017

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 December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)