OFFSET
1,3
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..30
Eric Weisstein's World of Mathematics, Bridged Graph
Eric Weisstein's World of Mathematics, Simple Graph
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Oct 29 2015
EXTENSIONS
More terms using formula by Falk Hüffner, Jan 18 2016
STATUS
approved