OFFSET
1,1
REFERENCES
H. P. Patil, R. Pandiya Raj, On the total graph of Mycielski graphs. central graphs and their covering numbers, Discussiones Math., Graph Theory, 33,2013, 361-371.
D. B. West, Introduction to Graph Theory, 2nd ed., Prentice-Hall, NJ, 2001, p. 205.
LINKS
FORMULA
a(n) = 6n^2 + 7n + 7.
G.f.: x*(20-15*x+7*x^2)/(1-x)^3.
The Hosoya-Wiener polynomial is (4n+1)t + (2n^2 + n + 2)t^2.
MAPLE
a := proc (n) options operator, arrow: 6*n^2+7*n+7 end proc: seq(a(n), n = 1 .. 42);
PROG
(PARI) a(n)=6*n^2+7*n+7 \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Emeric Deutsch, Aug 27 2013
STATUS
approved