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!)
A246888 Number of length n+4 0..4 arrays with some pair in every consecutive five terms totalling exactly 4 1
2701, 12481, 57585, 264981, 1216081, 5592169, 25710385, 118192273, 543322645, 2497751105, 11482493485, 52786380721, 242665353541, 1115563238521, 5128382983861, 23575813154485, 108380944031221, 498240685840957 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A246892

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +6*a(n-2) +5*a(n-3) +17*a(n-4) -16*a(n-5) -117*a(n-6) -174*a(n-7) -295*a(n-8) -478*a(n-9) +437*a(n-10) +1237*a(n-11) +663*a(n-12) +1581*a(n-13) +2542*a(n-14) -1551*a(n-15) -2164*a(n-16) -1754*a(n-17) -1473*a(n-18) +623*a(n-19) +1190*a(n-20) +651*a(n-21) +184*a(n-22) -263*a(n-23) -141*a(n-24) -109*a(n-25) -11*a(n-26) +46*a(n-27) +9*a(n-28) +10*a(n-29) +2*a(n-30) -3*a(n-31)

EXAMPLE

Some solutions for n=3

..4....4....4....1....4....4....1....4....4....1....4....4....0....3....3....2

..3....4....3....0....4....3....1....1....4....1....3....4....2....1....2....3

..2....4....1....1....3....0....4....4....2....4....4....0....0....2....3....2

..2....3....4....2....0....4....3....2....1....3....2....1....4....4....1....4

..3....0....0....2....4....2....1....2....2....4....1....0....3....1....3....1

..0....0....3....2....0....0....3....3....3....2....1....4....0....2....4....0

..3....2....0....4....3....0....3....4....1....0....0....0....2....1....1....4

CROSSREFS

Sequence in context: A253814 A054561 A230752 * A153513 A333130 A214016

Adjacent sequences:  A246885 A246886 A246887 * A246889 A246890 A246891

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 06 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 June 18 11:25 EDT 2021. Contains 345098 sequences. (Running on oeis4.)