A143588 Number of 2's in row n of the Kolakoski fan A143477.

0, 1, 2, 2, 3, 4, 6, 10, 15, 22, 33, 52, 74, 113, 168, 255, 377, 567, 850, 1280, 1916, 2878, 4324, 6473, 9720, 14577, 21862, 32766, 49150, 73758, 110640, 165962, 249013, 373405, 560201, 840358, 1260296, 1890539, 2835987, 4253676, 6380430, 9570746

Offset

1,3

Comments

A143586 = A143587 + A143588.

Links

Table of n, a(n) for n=1..42.

Example

The first 4 rows of A143477 are 1; 2; 22; 1122. The respective numbers of 1's are 0,1,2,2.

Crossrefs

Cf. A000002, A143477, A143486, A143487.

Sequence in context: A001611 A214448 A039829 * A284908 A329695 A103599

Adjacent sequences: A143585 A143586 A143587 * A143589 A143590 A143591

Keyword

nonn

Author

Clark Kimberling, Aug 25 2008

Status

approved