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A139760 First quadrisection of A115451. 1
1, 9, 137, 2185, 34953, 559241, 8947849, 143165577, 2290649225, 36650387593, 586406201481, 9382499223689, 150119987579017, 2401919801264265, 38430716820228233, 614891469123651721, 9838263505978427529, 157412216095654840457, 2518595457530477447305 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..500

Index entries for linear recurrences with constant coefficients, signature (17,-16)

FORMULA

a(n) = 16*a(n-1) - 7.

a(n) = (7 + 8*16^n)/15. - Paolo P. Lava, Jun 19 2008

G.f.: ( 1-8*x ) / ( (16*x-1)*(x-1) ). - R. J. Mathar, Feb 06 2011

MATHEMATICA

LinearRecurrence[{17, -16}, {1, 9}, 20] (* Harvey P. Dale, Apr 02 2018 *)

PROG

(MAGMA) [(7+8*16^n)/15: n in [0..20]]; // Vincenzo Librandi, Aug 09 2011

CROSSREFS

Sequence in context: A231757 A156975 A081876 * A112702 A296394 A322576

Adjacent sequences:  A139757 A139758 A139759 * A139761 A139762 A139763

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, May 20 2008

STATUS

approved

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Last modified April 10 19:06 EDT 2021. Contains 342853 sequences. (Running on oeis4.)