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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A169722 (3*2^(n-1)-1)*(18*2^(n-1)-7). 1
1, 22, 145, 715, 3151, 13207, 54055, 218695, 879751, 3528967, 14135815, 56583175, 226412551, 905809927, 3623559175, 14494875655, 57980780551, 231925678087, 927707824135, 3710841520135, 14843386527751, 59373587005447, 237494429810695, 949977882820615 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Alice V. Kleeva, Grid for this sequence

Alice V. Kleeva, Illustration of initial terms

Robert Munafo, Sequence A169720, and two others by Alice V. Kleeva

Robert Munafo, Sequence A169720, and two others by Alice V. Kleeva [Cached copy, in pdf format, included with permission]

Index entries for linear recurrences with constant coefficients, signature (7,-14,8).

FORMULA

G.f.: (1+15*x+5*x^2)/(1-7*x+14*x^2-8*x^3). - Bruno Berselli, Dec 04 2012

a(n) = 7*a(n-1)-14*a(n-2)+8*a(n-3). - Vincenzo Librandi, Dec 04 2012

MATHEMATICA

LinearRecurrence[{7, -14, 8}, {1, 22, 145}, 30] (* Vincenzo Librandi, Dec 04 2012 *)

PROG

(MAGMA) I:=[1, 22, 145]; [n le 3 select I[n] else 7*Self(n-1)-14*Self(n-2)+8*Self(n-3): n in [1..30]]; // Vincenzo Librandi, Dec 04 2012

(Maxima) makelist(coeff(taylor((1+15*x+5*x^2)/(1-7*x+14*x^2-8*x^3), x, 0, n), x, n), n, 0, 23); [Bruno Berselli, Dec 04 2012]

CROSSREFS

Cf. A169720-A169727, A033484.

Sequence in context: A125332 A126490 A200776 * A262139 A159505 A223836

Adjacent sequences:  A169719 A169720 A169721 * A169723 A169724 A169725

KEYWORD

nonn,easy

AUTHOR

Alice V. Kleeva (alice27353(AT)gmail.com), Jan 19 2010

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 October 20 15:22 EDT 2018. Contains 316388 sequences. (Running on oeis4.)