1,3

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: A068886 A104403 A144422 this_sequence A087886 A123754 A048354

Adjacent sequences: A135441 A135442 A135443 this_sequence A135445 A135446 A135447

nonn

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