1,2
J. A. Reeds and P. C. Fishburn, Counting split interval orders, Order, Vol. 18, No. 2, 2001, pp. 129-135.
Cf. A059685, A058259.
Sequence in context: A136127 A111004 A079566 * A000112 A205498 A178119
Adjacent sequences: A059682 A059683 A059684 * A059686 A059687 A059688
nonn
N. J. A. Sloane (njas(AT)research.att.com), Feb 05 2001