0,2

If Y is a fixed 4-subset of a 2n-set X then a(n) is the number of n-subsets of X intersecting Y - Milan R. Janjic (agnus(AT)blic.net), Oct 21 2007

Milan Janjic, Two Enumerative Functions

Sequence in context: A026029 A078483 A163135 this_sequence A148478 A148479 A150124

Adjacent sequences: A047033 A047034 A047035 this_sequence A047037 A047038 A047039

nonn

Clark Kimberling (ck6(AT)evansville.edu)