OFFSET
1,1
COMMENTS
One-half of ((number of vertices in graph SC(n,2)) - (number of vertices in graph SC(n,1))).
It would be nice to have a formula for this sequence. The graphs SC(n,1) are fairly well understood, while SC(n,m) is basically a mystery for m >= 2.
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 1..100
Scott R. Shannon, Colored illustration for the graph SC(2,1)
Scott R. Shannon, Colored illustration for the graph SC(2,2)
EXAMPLE
For n=2, SC(2,2) has 37 vertices and SC(2,1) has 13 vertices (see illustrations), so a(2) = (37-13)/2 = 12.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 14 2020
STATUS
approved