1,6
Keith M. Briggs, Combinatorial Graph Theory
A diagonal of triangle in A126744.
Sequence in context: A073565 A039657 A114473 * A107668 A197989 A174484
Adjacent sequences: A126744 A126745 A126746 * A126748 A126749 A126750
nonn
N. J. A. Sloane (njas(AT)research.att.com), Feb 18 2007
a(11) from Michael Sollami, Jan 29 2012.