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!)
A239334 Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it, modulo 4 1
5, 31, 172, 926, 5078, 27861, 152260, 832207, 4550810, 24881731, 136029644, 743697760, 4065948624, 22229220072, 121530709245, 664428372582, 3632538661095, 19859679158791, 108576093277449, 593603153333233 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A239340

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -28*a(n-2) +74*a(n-3) -181*a(n-4) +236*a(n-5) -261*a(n-6) +234*a(n-7) +200*a(n-8) -279*a(n-9) +104*a(n-10) -268*a(n-11) -36*a(n-12) +156*a(n-13) +104*a(n-14) -32*a(n-15) -16*a(n-16)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A034353 A294722 A237622 * A180635 A078526 A255236

Adjacent sequences:  A239331 A239332 A239333 * A239335 A239336 A239337

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 16 2014

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 September 19 17:19 EDT 2021. Contains 347564 sequences. (Running on oeis4.)