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A048008 Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-1)/3. 0
0, 0, 0, 1, 4, 10, 20, 41, 77, 126, 252, 505, 844, 1780, 3652, 5995, 12545, 25805, 41951, 88634, 184736, 299411, 636524, 1334942, 2154104, 4594244, 9685364, 15584085, 33355944, 70639794, 113406028, 243374923, 517215283, 828748052 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

CROSSREFS

Sequence in context: A100354 A352666 A275358 * A048019 A189586 A019498

Adjacent sequences: A048005 A048006 A048007 * A048009 A048010 A048011

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 29 20:10 EST 2023. Contains 359926 sequences. (Running on oeis4.)