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A047190 Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-2)/2. 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 7, 35, 40, 120, 135, 315, 350, 745, 825, 1881, 2106, 5490, 6240, 17160, 19635, 52339, 59855, 151775, 173160, 427336, 487305, 1207765, 1380405, 3490050 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Sequence in context: A037375 A159582 A041553 * A237711 A033043 A037411

Adjacent sequences:  A047187 A047188 A047189 * A047191 A047192 A047193

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 16 11:47 EDT 2021. Contains 347472 sequences. (Running on oeis4.)