A249041 Number of odd terms in first n terms of A249039.

1, 1, 1, 2, 3, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 7, 8, 8, 9, 10, 11, 12, 13, 13, 14, 15, 16, 16, 17, 17, 17, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 23, 23, 23, 24, 25, 25, 26, 26, 26, 26, 27, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 33, 33, 34, 35, 35, 36

Offset

1,4

Links

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

Rémy Sigrist, Colored scatterplot of (a(n-1-a(n-1))/n, a(a(n-1))/n) for n <= 500000000 (where the hue is function of n)

Formula

For n > 2: a(n) = a(n-1) + A249039(n) mod 2. - Reinhard Zumkeller, Nov 11 2014

a(n) = n - a(a(n-1)) - a(n-1-a(n-1)) with a(1) = a(2) = 1. - Altug Alkan, May 01 2019

Maple

See A249039.

Prog

(Haskell)
a249041 n = a249041_list !! (n-1)
a249041_list = tail $ scanl (\i j -> i + mod j 2) 0 a249039_list
-- Reinhard Zumkeller, Nov 11 2014

Crossrefs

Cf. A249039, A249040, A287422.

Sequence in context: A082090 A060197 A116487 * A070546 A034586 A268383

Adjacent sequences: A249038 A249039 A249040 * A249042 A249043 A249044

Keyword

nonn

Author

N. J. A. Sloane, Oct 26 2014

Status

approved