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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
OFFSET
1,10
CROSSREFS
Sequence in context: A037375 A159582 A041553 * A359530 A237711 A033043
KEYWORD
nonn
STATUS
approved