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!)
A281601 Number of nX4 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. 1
11, 110, 1283, 16198, 203276, 2563481, 32354824, 408458506, 5156857179, 65107404580, 822011501060, 10378295092963, 131031076361292, 1654331920396230, 20886756502623605, 263705605573971334 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A281605.

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) +3*a(n-2) -87*a(n-3) -125*a(n-4) -116*a(n-5) +69*a(n-6) +522*a(n-7) -148*a(n-8) -199*a(n-9) +690*a(n-10) -105*a(n-11) -265*a(n-12) -155*a(n-13) -84*a(n-14) -23*a(n-15) -13*a(n-16) for n>18

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281605.

Sequence in context: A285561 A285541 A185535 * A266513 A055016 A259372

Adjacent sequences:  A281598 A281599 A281600 * A281602 A281603 A281604

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 25 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 January 21 05:57 EST 2022. Contains 350473 sequences. (Running on oeis4.)