OFFSET
1,2
EXAMPLE
a(6) = (1/2)*<6/1>*<6/2>*<6/3>*<6/4>*<6/5>*<6/6> = (1/2)*7*4*3*1*2*2 = 168, where <x> denotes the integer second-nearest to x, as defined at A075998.
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 29 2002
STATUS
approved