login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A240462 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4 1
12, 102, 874, 7589, 65723, 568370, 4916340, 42530527, 367908385, 3182471383, 27528807013, 238127592175, 2059829147851, 17817722472564, 154124971684131, 1333195242928609, 11532260863126369, 99755106819505532, 862890740313446216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A240460

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -105*a(n-2) +200*a(n-3) +242*a(n-4) -2119*a(n-5) +7083*a(n-6) -9004*a(n-7) -24192*a(n-8) +72426*a(n-9) -3118*a(n-10) -103236*a(n-11) -4239*a(n-12) +64281*a(n-13) +119026*a(n-14) -161710*a(n-15) +142844*a(n-16) -25892*a(n-17) -337024*a(n-18) +223288*a(n-19) +175280*a(n-20) -145120*a(n-21) -22528*a(n-22) +23040*a(n-23)

EXAMPLE

Some solutions for n=4

..2..2..0..2....0..0..2..2....2..2..2..2....2..0..2..0....0..2..0..2

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

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

CROSSREFS

Sequence in context: A082151 A125375 A217057 * A126533 A052148 A133384

Adjacent sequences:  A240459 A240460 A240461 * A240463 A240464 A240465

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 05 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 July 19 03:54 EDT 2019. Contains 325144 sequences. (Running on oeis4.)