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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A275636 a(n) = (3^n-1)*(3^n+3)/3!. 1
0, 2, 16, 130, 1120, 9922, 88816, 797890, 7176640, 64576642, 581150416, 5230235650, 47071766560, 423644836162, 3812800336816, 34315193465410, 308836712490880, 2779530326324482, 25015772678640016, 225141953332919170, 2026277577671749600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

Turner, Zachary J., Bryson W. Finklea, and Terri Moore. "Combinatorial Approaches to Minimal Zero Sequences of Finite Abelian Groups, and a Surprising Connection." Preprint, Jan 09 2004.

LINKS

Colin Barker, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (13,-39,27).

FORMULA

From Chai Wah Wu, Aug 09 2016: (Start)

a(n) = 13*a(n-1) - 39*a(n-2) + 27*a(n-3) for n > 2.

G.f.: 2*x*(5*x - 1)/((x - 1)*(3*x - 1)*(9*x - 1)). (End)

a(n) = (2*3^n+9^n-3)/6. - Colin Barker, Aug 10 2016

CROSSREFS

Sequence in context: A067684 A074623 A323946 * A002576 A037727 A037622

Adjacent sequences:  A275633 A275634 A275635 * A275637 A275638 A275639

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Aug 09 2016

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 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)