5,2

G.f.: x^6(x^9-x^5-4x^4-15x^3+20x^2-15x+6)/[(1-x)^6(1-x^5)^2]. a(n) = A000389(n) - [5 divides n]*n/5 = n*floor(C(n-1, 4)/5). - R. Stephan, Aug 18 2004

Equals n*A051170(n).

Sequence in context: A002817 A132366 A015641 this_sequence A008498 A015640 A138780

Adjacent sequences: A050187 A050188 A050189 this_sequence A050191 A050192 A050193

nonn

Clark Kimberling (ck6(AT)evansville.edu)

More terms from R. Stephan, Aug 18 2004