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!)
A208875 Number of 4Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors 1
15, 1979, 324682, 52947540, 8624977114, 1404920207834, 228847686794351, 37277070892199501, 6072074518379364073, 989082262060956074133, 161111942886719306980432, 26243578660069203997974518 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A208872

LINKS

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

FORMULA

Empirical: a(n) = 222*a(n-1) -10949*a(n-2) +228692*a(n-3) -2273610*a(n-4) +10170544*a(n-5) -13839646*a(n-6) -45418980*a(n-7) +225253855*a(n-8) -439046430*a(n-9) +509809347*a(n-10) -407061936*a(n-11) +239595084*a(n-12) -96068592*a(n-13) +18662400*a(n-14) for n>16

EXAMPLE

Some solutions for n=4

..0..1..1..1....0..0..1..0....0..1..1..0....0..0..0..1....0..0..0..0

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

..1..1..0..0....3..2..0..1....1..2..1..1....0..1..1..3....0..0..1..1

..0..1..1..1....0..3..3..1....3..1..0..0....3..0..3..1....1..0..0..2

CROSSREFS

Sequence in context: A232305 A282946 A319623 * A199098 A208784 A126681

Adjacent sequences:  A208872 A208873 A208874 * A208876 A208877 A208878

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 2012

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 4 05:56 EST 2021. Contains 349470 sequences. (Running on oeis4.)