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!)
A280675 Number of 3Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. 1
5, 82, 858, 10205, 119440, 1401470, 16438612, 192831783, 2261964301, 26533504354, 311245493388, 3650998431229, 42827250423319, 502375841919309, 5893011645334528, 69126704336253119, 810875921978239834 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A280673.

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) +23*a(n-2) -160*a(n-3) -172*a(n-4) +690*a(n-5) +601*a(n-6) -513*a(n-7) -1314*a(n-8) -1903*a(n-9) +1720*a(n-10) +2445*a(n-11) -549*a(n-12) -998*a(n-13) +40*a(n-14) +136*a(n-15) +96*a(n-16) -32*a(n-17) -64*a(n-18) for n>20

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A280673.

Sequence in context: A197443 A337852 A280220 * A209102 A274388 A308753

Adjacent sequences:  A280672 A280673 A280674 * A280676 A280677 A280678

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 07 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 October 28 17:19 EDT 2021. Contains 348329 sequences. (Running on oeis4.)