4,2

P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics.

Cf. A000682.

Sequence in context: A095252 A102207 A045992 this_sequence A030529 A081113 A114587

Adjacent sequences: A046720 A046721 A046722 this_sequence A046724 A046725 A046726

nonn

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