login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A240334 Number of nX3 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4 1
7, 48, 316, 1543, 6271, 22116, 69596, 199504, 528924, 1310622, 3062243, 6794265, 14399820, 29296378, 57452518, 108986486, 200594945, 359164115, 627034377, 1069540186, 1785635484, 2922647926, 4696491195, 7419012596, 11534573228 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A240338
LINKS
FORMULA
Empirical: a(n) = (1/1556755200)*n^13 + (13/479001600)*n^12 + (709/239500800)*n^11 - (1097/43545600)*n^10 + (4523/2419200)*n^9 - (600197/14515200)*n^8 + (21519737/21772800)*n^7 - (738857411/43545600)*n^6 + (5266122739/21772800)*n^5 - (29277165523/10886400)*n^4 + (450145058857/19958400)*n^3 - (224785067849/1663200)*n^2 + (23586754661/45045)*n - 987842 for n>12
EXAMPLE
Some solutions for n=4
..0..3..0....0..0..0....3..0..0....0..0..0....0..0..3....0..0..3....0..0..3
..0..0..3....0..0..0....0..3..0....0..3..0....3..0..3....3..0..3....0..0..3
..0..3..0....0..3..3....3..3..1....0..0..3....0..3..3....3..3..3....0..3..2
..3..2..2....0..0..3....3..2..2....0..0..3....3..3..2....3..3..2....3..3..3
CROSSREFS
Sequence in context: A088143 A124880 A227100 * A171312 A186161 A081106
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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 31 04:44 EDT 2023. Contains 363061 sequences. (Running on oeis4.)