0,6

W. G. Brown, Enumeration of non-separable planar maps, Canad. J. Math., 15 (1963), 526-545.

Reference gives generating functions.

Sequence in context: A075425 A074294 A062050 this_sequence A162190 A134292 A108715

Adjacent sequences: A046650 A046651 A046652 this_sequence A046654 A046655 A046656

tabl,nonn,easy,more

N. J. A. Sloane (njas(AT)research.att.com).