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!)
A280855 Number of nX4 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
11, 110, 96, 124, 216, 462, 1005, 2010, 3907, 7756, 15749, 31804, 63463, 126758, 254453, 511180, 1024877, 2052836, 4115191, 8254198, 16552251, 33182160, 66522097, 133381078, 267442273, 536212952, 1075064777, 2155474072, 4321733703 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 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) +3*a(n-5) -4*a(n-6) -3*a(n-7) -4*a(n-10) +2*a(n-12) for n>16

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A280859.

Sequence in context: A331537 A169631 A308005 * A103542 A293871 A336880

Adjacent sequences:  A280852 A280853 A280854 * A280856 A280857 A280858

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 21 15:36 EDT 2022. Contains 353921 sequences. (Running on oeis4.)