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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A090411 G.f.: (1-x)/(1-16x). 0
1, 15, 240, 3840, 61440, 983040, 15728640, 251658240, 4026531840, 64424509440, 1030792151040, 16492674416640, 263882790666240, 4222124650659840, 67553994410557440, 1080863910568919040, 17293822569102704640, 276701161105643274240, 4427218577690292387840 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

Index entries for linear recurrences with constant coefficients, signature (16).

FORMULA

a(n) = 15*16^(n-1)+0^n/16.

a(n) = sum{j=0..3, sum{k=0..n, C(4n+j, 4k) }}.

a(n) = (A070775(n) + A090407(n) + A001025(n) + A090408(n))/4.

MATHEMATICA

Join[{1, a = 15}, Table[a=16*a, {n, 0, 30}]] (* Vladimir Joseph Stephan Orlovsky, Jun 10 2011 *)

Join[{1}, NestList[16#&, 15, 20]] (* Harvey P. Dale, Dec 28 2016 *)

PROG

(PARI) a(n)=if(n, 15<<(4*n-4), 1) \\ Charles R Greathouse IV, Jun 10 2011

CROSSREFS

Cf. A090409.

Sequence in context: A097262 A158557 A220821 * A154806 A133199 A059760

Adjacent sequences:  A090408 A090409 A090410 * A090412 A090413 A090414

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Nov 30 2003

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 20 08:12 EST 2017. Contains 294962 sequences.