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A047178
Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-1)/2.
0
0, 0, 0, 0, 0, 0, 6, 10, 40, 60, 150, 210, 455, 630, 1470, 2142, 5544, 8400, 21630, 32802, 80520, 121110, 290400, 437580, 1056627, 1608607, 3929926, 6034600, 14742910, 22712326, 55107598, 84996158, 205272008, 317302008
OFFSET
1,7
CROSSREFS
Sequence in context: A038264 A094890 A213477 * A132095 A332441 A153328
KEYWORD
nonn
STATUS
approved