1,1

1. One and only one route exists on all edges of G

2. Terminals of two different routes don't meet on the same point

Cf. A131709.

Sequence in context: A053917 A005832 A075768 this_sequence A086895 A090086 A007535

Adjacent sequences: A135439 A135440 A135441 this_sequence A135443 A135444 A135445

nonn,more,bref

Yasutoshi Kohmoto zbi74583(AT)boat.zero.ad.jp, Feb 18 2008