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A131355 Partial sums of A065423 plus one. 1
1, 1, 1, 3, 4, 8, 10, 16, 19, 27, 31, 41, 46, 58, 64, 78, 85, 101, 109, 127, 136, 156, 166, 188, 199, 223, 235, 261, 274, 302, 316, 346, 361, 393, 409, 443, 460, 496, 514, 552, 571, 611, 631, 673, 694, 738, 760, 806, 829, 877, 901, 951, 976, 1028, 1054, 1108 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..55.

FORMULA

G.f.:(1+2*x^3+2*x^4-2*x^2)/((1+x)^2*(1-x)^3). a(n)=a(n-1)+2*a(n-2)-2*a(n-3)-a(n-4)+a(n-5). [From R. J. Mathar, Jul 17 2009]

MAPLE

A065423 := proc(n) if n mod 2 <> 0 then n-1 ; else n/2-1 ; fi ; end: A131355 := proc(n) 1+add(A065423(i), i=1..n) ; end: seq(A131355(n), n=0..80) ; - R. J. Mathar, Oct 04 2007

CROSSREFS

Cf. A065423.

Sequence in context: A063414 A026494 A043306 * A092534 A005232 A165272

Adjacent sequences:  A131352 A131353 A131354 * A131356 A131357 A131358

KEYWORD

nonn

AUTHOR

Paul Curtz, Sep 30 2007

EXTENSIONS

More terms from R. J. Mathar, Oct 04 2007

STATUS

approved

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Last modified May 23 22:29 EDT 2013. Contains 225613 sequences.