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A348240
a(n) = Sum_{k = 1..floor(n/2)} A003041(n-2*k).
1
1, 2, 8, 26, 100
OFFSET
1,2
LINKS
H. Sharp, Jr., Enumeration of vacuously transitive relations, Discrete Math. 4 (1973), 185-196.
CROSSREFS
Cf. A003041.
Sequence in context: A129368 A357221 A281345 * A128238 A110156 A295934
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 13 2021
STATUS
approved