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!)
A274898 Number of 6Xn 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-1) or (-2,0) and new values introduced in order 0..2. 1
24, 50, 192, 753, 3017, 12217, 49697, 202749, 828828, 3391310, 13878192, 56789705, 232384474, 950977585, 3891812709, 15927107508, 65180736176, 266747574843, 1091648042865, 4467513170474, 18283077346563, 74822562153129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A274895.

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) -77*a(n-2) +286*a(n-3) -736*a(n-4) +1351*a(n-5) -1787*a(n-6) +1716*a(n-7) -1217*a(n-8) +652*a(n-9) -265*a(n-10) +78*a(n-11) -14*a(n-12) +a(n-13) for n>14

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A274895.

Sequence in context: A042150 A087355 A132765 * A025137 A070197 A190524

Adjacent sequences:  A274895 A274896 A274897 * A274899 A274900 A274901

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 10 2016

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 August 5 00:15 EDT 2021. Contains 346456 sequences. (Running on oeis4.)