OFFSET
1,1
LINKS
Paolo Xausa, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Andrásfai Graph
Eric Weisstein's World of Mathematics, Minimum Dominating Set
Index entries for linear recurrences with constant coefficients, signature (2,-1).
FORMULA
a(n) = A016957(n-1) = 2*(3*n-1) for n > 3.
G.f.: x*(2 + x + 16*x^2 - 21*x^3 + 8*x^4)/(-1 + x)^2.
MATHEMATICA
LinearRecurrence[{2, -1}, {2, 5, 24, 22, 28}, 100] (* Paolo Xausa, Sep 01 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Sep 05 2021
STATUS
approved