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A115367 Row sums of correlation triangle for Fredholm-Rueppel sequence A036987. 1
1, 2, 2, 4, 4, 4, 5, 6, 7, 6, 9, 6, 9, 6, 10, 8, 12, 8, 14, 8, 14, 8, 16, 8, 16, 8, 16, 8, 16, 8, 17, 10, 19, 10, 21, 10, 21, 10, 23 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

If a sequence has g.f. A(x), its correlation triangle has g.f. A(x)A(x*y)/(1-x^2*y). (Observation due to Christian G. Bower).

LINKS

Table of n, a(n) for n=0..38.

FORMULA

G.f. : (sum{k>=0, x^(2k-1)})^2/(1-x^2); a(n)=sum{k=0..n, sum{j=0..k, A036987(j)}*sum{j=0..n-k, A036987(j)*(-1)^(n-k-j)}}.

CROSSREFS

Sequence in context: A230875 A035660 A302405 * A084841 A144202 A157887

Adjacent sequences:  A115364 A115365 A115366 * A115368 A115369 A115370

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jan 21 2006

STATUS

approved

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Last modified May 28 12:02 EDT 2020. Contains 334681 sequences. (Running on oeis4.)