Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A133667
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A133667 a(n)=a(n-1)-25*a(n-2), a(0)=1, a(1)=5 . +0
2
1, 5, -20, -145, 355, 3980, -4895, -104395, 17980, 2627855, 2178365, -63518020, -117976895, 1469973605, 4419395980, -32329944145, -142814843645, 665433759980, 4235804851105, -12400039148395, -118295160426020, 191705818283855 (list; graph; listen)
OFFSET

0,2

FORMULA

G.f.:(1+4*x)/(1-x+25*x^2) .

a(n)=Sum_{k, 0<=k<=n}A133607(n,k)*5^k. - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 29 2007

a(n)=(3/22)*I*sqrt(11)*[1/2-(3/2)*I*sqrt(11)]^n+(1/2)*[1/2-(3/2)*I*sqrt(11)]^n+(1/2)*[1/2 +(3/2)*I*sqrt(11)]^n-(3/22)*I*sqrt(11)*[1/2+(3/2)*I*sqrt(11)]^n, with n>=0 and I=sqrt(-1) [From Paolo P. Lava (ppl(AT)spl.at), Aug 27 2008]

CROSSREFS

Sequence in context: A024066 A009569 A061964 this_sequence A000877 A077817 A032324

Adjacent sequences: A133664 A133665 A133666 this_sequence A133668 A133669 A133670

KEYWORD

easy,sign

AUTHOR

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 28 2007

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 9 18:50 EST 2009. Contains 170568 sequences.


AT&T Labs Research