A143592 Number of 2's in row n of A143589 (a Kolakoski fan).

0, 1, 0, 1, 1, 3, 3, 6, 8, 12, 18, 26, 40, 60, 89, 135, 201, 303, 453, 680, 1022, 1528, 2299, 3443, 5176, 7750, 11642, 17443, 26172, 39246, 58874, 88308, 132461, 198694, 298094, 447097, 670645, 1005992, 1508898, 2263540

Offset

1,6

Comments

A143590 = A143591 + A143592.

Links

Table of n, a(n) for n=1..40.

Example

The first 6 rows of A143589 are 1; 2; 1,1; 2,1; 1,1,2; 2,1,2,2. The
respective numbers of 1's are 0,1,0,1,1,3.

Crossrefs

Cf. A000002, A143587, A143589, A143590, A143591.

Sequence in context: A239946 A130780 A174524 * A280197 A333526 A097307

Adjacent sequences: A143589 A143590 A143591 * A143593 A143594 A143595

Keyword

nonn

Author

Clark Kimberling, Aug 25 2008

Status

approved