1,7
Keith M. Briggs, Combinatorial Graph Theory
A diagonal of triangle in A126744.
Sequence in context: A195636 A062440 A197764 * A048144 A144682 A096987
Adjacent sequences: A126745 A126746 A126747 * A126749 A126750 A126751
nonn
N. J. A. Sloane (njas(AT)research.att.com), Feb 18 2007
a(11) from Michael Sollami, Jan 29 2012.