2,2

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

Cf. A000682.

Sequence in context: A151281 A045694 A129772 this_sequence A151528 A132803 A079565

Adjacent sequences: A046718 A046719 A046720 this_sequence A046722 A046723 A046724

nonn

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