A219609 Half of first differences of A219608.

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

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