A090168 Floor( 3n/2 ) - floor( 2n/3 ).

0, 1, 2, 2, 4, 4, 5, 6, 7, 7, 9, 9, 10, 11, 12, 12, 14, 14, 15, 16, 17, 17, 19, 19, 20, 21, 22, 22, 24, 24, 25, 26, 27, 27, 29, 29, 30, 31, 32, 32, 34, 34, 35, 36, 37, 37, 39, 39, 40, 41, 42, 42, 44, 44, 45, 46, 47, 47, 49, 49, 50, 51, 52, 52, 54, 54, 55, 56, 57, 57, 59, 59, 60

Offset

0,3

Links

Table of n, a(n) for n=0..72.

Formula

a(n) = a(n-2) + a(n-3) - a(n-5).

G.f.: x*(1 + 2*x + x^2 + x^3)/(1 - x^2 - x^3 + x^5).

Mathematica

a[n_] := Floor[3n/2] - Floor[2n/3]
Table[a[n], {n, 0, 90}]    (* A090168 *)

Crossrefs

Cf. A090169.

Sequence in context: A302929 A129229 A219029 * A389646 A394023 A342498

Adjacent sequences: A090165 A090166 A090167 * A090169 A090170 A090171

Keyword

nonn,easy

Author

Clark Kimberling, Nov 23 2003

Status

approved