0,7

Table of n, a(n) for n=0..88.

G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.

Index entries for Molien series

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,1,-1).

Molien series is 1/((1-x^2)*(1-x^12)).

a(n)= Sum_{k=0..n} 1/90*{-14*[k mod 6]+[(k+1) mod 6]+[(k+2) mod 6]+[(k+3) mod 6]+[(k+4) mod 6]+16*[(k+5) mod 6]}, with n>=0. - Paolo P. Lava, May 15 2007

a(n)=1+floor(n/6)

a(n)=1+(6*n-15+3*(-1)^n+12*sin[(2*n+1)*Pi/6]+4*sqrt(3)*sin[(2*n+1)*Pi/3])/36

Apart from initial terms, same as A054895.

Sequence in context: A321018 A152467 A242602 * A195177 A147583 A054895

Adjacent sequences: A097989 A097990 A097991 * A097993 A097994 A097995

nonn

N. J. A. Sloane, Sep 07 2004

approved