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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A099216 a(n)=4a(n-1)-4a(n-2)+2a(n-3). 2
 1, 2, 4, 10, 28, 80, 228, 648, 1840, 5224, 14832, 42112, 119568, 339488, 963904, 2736800, 7770560, 22062848, 62642752, 177860736, 504997632, 1433833088, 4071063296, 11558916096, 32819077376, 93182771712, 264572609536 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Binomial transform of tribonacci numbers A000213. LINKS Table of n, a(n) for n=0..26. Index entries for linear recurrences with constant coefficients, signature (4,-4,2). FORMULA G.f.: (1-2x)/((1-2x)^2-2x^3); a(n)=sum{k=0..floor(n/3), binomial(n-k, 2k)2^k*2^(n-3k)}. CROSSREFS Cf. A099214, A099215, A055588. Sequence in context: A106362 A271896 A148109 * A149819 A276051 A149820 Adjacent sequences: A099213 A099214 A099215 * A099217 A099218 A099219 KEYWORD easy,nonn AUTHOR Paul Barry, Oct 06 2004 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.

Last modified September 29 19:04 EDT 2023. Contains 365775 sequences. (Running on oeis4.)