1,2

J. D. Horton and A. Kurn, Counting sequences with complete increasing subsequences, Congress Numerantium, 33 (1981), 75-80.

Reference gives explicit formula.

Sequence in context: A078955 A107673 A130037 this_sequence A051847 A002115 A054949

Adjacent sequences: A047907 A047908 A047909 this_sequence A047911 A047912 A047913

nonn

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