0,3

If n = 2^a*3^b, then a(n)-a(n-1) = C(a+b, a). - David Wasserman, Nov 17 2005

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

(Haskell)

a061984 n = a061984_list !! n

a061984_list = 0 : map (+ 1) (zipWith (+)

(map (a061984 . (`div` 2)) [1..]) (map (a061984 . (`div` 3)) [1..]))

-- Reinhard Zumkeller, Jan 11 2014

Cf. A061980, A061985, A061986, A061987.

Cf. A007731.

Sequence in context: A160680 A243069 A342496 * A337125 A063208 A343912

Adjacent sequences: A061981 A061982 A061983 * A061985 A061986 A061987

nonn

Henry Bottomley, May 24 2001

approved