A219609 - OEIS

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A219609

Half of first differences of A219608.

2

1, 2, 1, 3, 2, 3, 3, 1, 3, 6, 3, 3, 2, 3, 3, 9, 3, 6, 3, 3, 1, 3, 6, 3, 3, 18, 3, 3, 9, 3, 6, 3, 3, 2, 3, 3, 9, 3, 6, 3, 3, 33, 3, 6, 3, 3, 18, 3, 3, 9, 3, 6, 3, 3, 1, 3, 6, 3, 3, 18, 3, 3, 9, 3, 6, 3, 3, 66, 3, 3, 9, 3, 6, 3, 3, 33, 3, 6, 3, 3, 18, 3, 3, 9

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

a(n) = (A219608(n+1) - A219608(n)) / 2.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG

(Haskell)

a219609 n = a219609_list !! (n-1)

a219609_list = map (`div` 2) $ zipWith (-) (tail a219608_list) a219608_list

CROSSREFS

Sequence in context: A083290 A121842 A317963 * A087825 A263100 A261388

Adjacent sequences: A219606 A219607 A219608 * A219610 A219611 A219612

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Nov 26 2012

STATUS

approved