A249040 Number of even terms in first n terms of A249039.

0, 1, 2, 2, 2, 2, 3, 3, 4, 5, 6, 7, 7, 8, 9, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 13, 14, 14, 14, 15, 15, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 24, 25, 26, 27, 28, 28, 29, 30, 30, 30, 31, 31, 32, 33, 34, 34, 35, 36, 36, 36, 37, 37, 37, 37, 38, 38, 39, 40, 40, 40, 41, 41

Offset

1,3

Links

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

Formula

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

Maple

See A249039.

Prog

(Haskell)
a249040 n = a249040_list !! (n-1)
a249040_list = tail $ scanl (\i j -> i + 1 - mod j 2) 0 a249039_list
-- Reinhard Zumkeller, Nov 11 2014

Crossrefs

Cf. A249039, A249041.

Sequence in context: A140436 A236916 A029083 * A153683 A275882 A005139

Adjacent sequences: A249037 A249038 A249039 * A249041 A249042 A249043

Keyword

nonn

Author

N. J. A. Sloane, Oct 26 2014

Status

approved