login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A048502 a(n) = 2^(n-1)*(9*n-16)+9. 1
1, 2, 13, 53, 169, 473, 1225, 3017, 7177, 16649, 37897, 85001, 188425, 413705, 901129, 1949705, 4194313, 8978441, 19136521, 40632329, 85983241, 181403657, 381681673, 801112073, 1677721609, 3506438153, 7314866185, 15233712137, 31675383817, 65766686729 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..2000

Index entries for linear recurrences with constant coefficients, signature (5,-8,4).

FORMULA

a(n) = T(8, n), array T given by A048494.

a(n) = 2^(n-1)*(9n-16)+9 = A000079(n-1)*A017185(n-2)+9. - Wesley Ivan Hurt, Dec 04 2013

G.f.: (1-3*x+11*x^2) / ((1-x)*(1-2*x)^2). - Colin Barker, Aug 24 2016

MAPLE

A048502:=n->2^(n-1)*(9*n-16)+9; seq(A048502(n), n=0..30); # Wesley Ivan Hurt, Dec 04 2013

MATHEMATICA

Table[2^(n-1)*(9n-16)+9, {n, 0, 30}] (* Wesley Ivan Hurt, Dec 04 2013 *)

PROG

(MAGMA) [2^(n-1)*(9*n-16)+9 : n in [0..30]]; // Vincenzo Librandi, Sep 25 2011

(PARI) Vec((1-3*x+11*x^2)/((1-x)*(1-2*x)^2) + O(x^40)) \\ Colin Barker, Aug 24 2016

CROSSREFS

Cf. A048494.

Sequence in context: A037383 A034476 A030517 * A177077 A144235 A180041

Adjacent sequences:  A048499 A048500 A048501 * A048503 A048504 A048505

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling

EXTENSIONS

Formula and more terms from Ralf Stephan, Jan 15 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 11 20:03 EDT 2020. Contains 335652 sequences. (Running on oeis4.)