OFFSET
0,3
REFERENCES
S. J. Cyvin et al., Polygonal systems including the corannulene and coronene homologs: novel applications of PĆ³lya's theorem, Z. Naturforsch., 52a (1997), 867-873.
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,2,0,-1,1,0,-2,0,1).
FORMULA
a(n)=5n/8+39/80+n^2/8+(-1)^n*(n/8+5/16)-(4*A010891(n)+3*A010891(n-1)+2*A010891(n-2)+A010891(n-3))/5. - R. J. Mathar, Jun 17 2009
MAPLE
MATHEMATICA
CoefficientList[Series[x (1+3x+x^2)/((1-x^2)^2(1-x^5)), {x, 0, 60}], x] (* or *) LinearRecurrence[{0, 2, 0, -1, 1, 0, -2, 0, 1}, {0, 1, 3, 3, 6, 5, 10, 10, 15}, 60] (* Harvey P. Dale, Aug 03 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved