OFFSET
1,1
COMMENTS
For n >= 3, number of independent vertex sets in the n-dipyramid graph.
LINKS
Eric Weisstein's World of Mathematics, Dipyramidal Graph
Eric Weisstein's World of Mathematics, Independent Vertex Set
Index entries for linear recurrences with constant coefficients, signature (2,0,-1).
FORMULA
MATHEMATICA
LucasL[Range[20]] + 3
Table[LucasL[n] + 3, {n, 20}]
LinearRecurrence[{2, 0, -1}, {4, 6, 7}, 20]
CoefficientList[Series[(4 - 2 x - 5 x^2)/(1 - 2 x + x^3), {x, 0, 20}], x]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Oct 11 2023
STATUS
approved