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A115639 First column of divide-and-conquer triangle A115636. 2
1, 1, 4, 4, 4, 4, 16, 16, 16, 16, 16, 16, 16, 16, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..60.

FORMULA

G.f.: (1/(1-x))(1/4+(3/4)*sum{k>=1, 4^(k-1)x^(2^k-2)}).

CROSSREFS

Sequence in context: A202686 A134660 A132383 * A242954 A062732 A100777

Adjacent sequences:  A115636 A115637 A115638 * A115640 A115641 A115642

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jan 27 2006

STATUS

approved

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)