A048096 - OEIS

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A048096

Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= sqrt(n).

0, 0, 0, 0, 2, 8, 20, 41, 63, 126, 252, 505, 1000, 1936, 3652, 7305, 14313, 27573, 52325, 97868, 180404, 327692, 586568, 1034930, 2718254, 5012504, 9131804, 16440929, 29259404, 51482510, 89575460, 154146135, 262403715, 441956955

(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: A364583 A058037 A203420 * A072250 A220908 A057566

Adjacent sequences: A048093 A048094 A048095 * A048097 A048098 A048099

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved