A139760 First quadrisection of A115451.

1, 9, 137, 2185, 34953, 559241, 8947849, 143165577, 2290649225, 36650387593, 586406201481, 9382499223689, 150119987579017, 2401919801264265, 38430716820228233, 614891469123651721, 9838263505978427529, 157412216095654840457, 2518595457530477447305

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.

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 A367426 A296394

Adjacent sequences: A139757 A139758 A139759 * A139761 A139762 A139763

Keyword

nonn,easy

Author

Paul Curtz, May 20 2008

Status

approved