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A152895 Partial sums of A152891. 2
0, 2, 11, 40, 123, 349, 951, 2539, 6710, 17645, 46290, 121302, 317706, 831920, 2178173, 5702734, 14930181, 39087979, 102333945, 267914065, 701408480, 1836311627, 4807526676, 12586268700, 32951279748, 86267570894, 225851433311 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..27.

Index entries for linear recurrences with constant coefficients, signature (6,-13,13,-6,1).

FORMULA

G.f.: x^2(2-x)/((1-3x+x^2)(1-x)^3). a(n)=A001906(n+1)-A000217(n+1). [From R. J. Mathar, Jan 08 2009]

a(1)=0, a(2)=2, a(3)=11, a(4)=40, a(5)=123, a(n)=6*a(n-1)-13*a(n-2)+ 13*a(n-3)- 6*a(n-4)+a(n-5). - Harvey P. Dale, Mar 26 2015

MATHEMATICA

lst={}; a=b=s=0; Do[b+=n+a; a+=n+b; s+=a; AppendTo[lst, s], {n, 0, 2*4!}]; lst

Accumulate[LinearRecurrence[{5, -8, 5, -1}, {0, 2, 9, 29}, 30]] (* or *) LinearRecurrence[{6, -13, 13, -6, 1}, {0, 2, 11, 40, 123}, 30] (* Harvey P. Dale, Mar 26 2015 *)

CROSSREFS

Cf. A152891

Sequence in context: A125064 A055329 A193005 * A176621 A000822 A154813

Adjacent sequences:  A152892 A152893 A152894 * A152896 A152897 A152898

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Dec 14 2008

STATUS

approved

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Last modified August 29 10:37 EDT 2015. Contains 261188 sequences.