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A156563
a(n) = (-1)^n*Sum_{k=1..n}
A078649
(k)*(-1)^k.
2
2, 2, 6, 5, 8, 8, 10, 12, 14, 14, 17, 18, 20, 20, 24, 24, 27, 26, 30, 28, 34, 31, 36, 34, 40, 38, 42, 41, 44, 45, 47, 47, 50, 49, 54, 53, 57, 55, 60, 59, 62, 62, 64, 66, 67, 68, 70, 70, 74, 74, 76, 77, 80, 80, 82, 83, 84, 87, 88, 90, 90, 94, 94, 96, 97, 100, 101
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OFFSET
1,1
LINKS
Jinyuan Wang,
Table of n, a(n) for n = 1..1000
CROSSREFS
Cf.
A078649
,
A156562
.
Sequence in context:
A115255
A055924
A286278
*
A201500
A054917
A111419
Adjacent sequences:
A156560
A156561
A156562
*
A156564
A156565
A156566
KEYWORD
nonn
AUTHOR
Benoit Cloitre
, Feb 10 2009
STATUS
approved
