A145730 Partial sums of A108019.

0, 4, 40, 332, 2672, 21396, 171192, 1369564, 10956544, 87652388, 701219144, 5609753196, 44878025616, 359024204980, 2872193639896, 22977549119228, 183820392953888, 1470563143631172, 11764505149049448, 94116041192395660

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Index entries for linear recurrences with constant coefficients, signature (10,-17,8).

Formula

a(n) = Sum_{i=0..n} A108019(i).

a(n) = 4*(8^(n+1)-7n-8)/49 = 4*A014831(n). - R. J. Mathar, Oct 21 2008

a(0)=0, a(1)=4, a(2)=40, a(n)=10*a(n-1)-17*a(n-2)+8*a(n-3). - Harvey P. Dale, Aug 08 2013

a(n) = A145729(n)/2. G.f.: -4*x / ((x-1)^2*(8*x-1)). - Colin Barker, Oct 28 2014

Mathematica

lst={}; s=0; Do[s+=(s+=(s+=n+s)); AppendTo[lst, s], {n, 0, 5!}]; lst
Accumulate[NestList[8#+4&, 0, 20]] (* or *) LinearRecurrence[{10, -17, 8}, {0, 4, 40}, 20] (* Harvey P. Dale, Aug 08 2013 *)

Prog

(PARI) concat(0, Vec(-4*x/((x-1)^2*(8*x-1)) + O(x^100))) \\ Colin Barker, Oct 28 2014

Crossrefs

Cf. A108019, A145729.

Sequence in context: A381106 A043031 A121126 * A069721 A223176 A279574

Adjacent sequences: A145727 A145728 A145729 * A145731 A145732 A145733

Keyword

nonn,easy

Author

Vladimir Joseph Stephan Orlovsky, Oct 17 2008

Extensions

Edited by R. J. Mathar, Oct 21 2008

Status

approved