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!)
A240365 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or two plus the sum of the elements diagonally to its northwest, modulo 4 1
4, 15, 51, 188, 672, 2452, 8822, 32077, 115811, 420299, 1519980, 5510943, 19945570, 72279704, 261698918, 948113920, 3433420924, 12437397618, 45043913721, 163158785746, 590931290044, 2140411544446, 7752356423111, 28079348085009 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A240364

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +9*a(n-2) -23*a(n-3) -15*a(n-4) +30*a(n-5) +20*a(n-6) +7*a(n-7) -30*a(n-8) +a(n-9) +23*a(n-10) -8*a(n-11) -8*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

CROSSREFS

Sequence in context: A055218 A303843 A107307 * A005492 A003013 A117202

Adjacent sequences:  A240362 A240363 A240364 * A240366 A240367 A240368

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 04 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 May 18 01:26 EDT 2021. Contains 343992 sequences. (Running on oeis4.)