OFFSET
1,18
EXAMPLE
n=20, d(C[ 20,10 ])= 48 and the d(C[ 20,k ]) values are 1,6,8,16,24,40,64,80. The maximum is 80, so the difference is 80-48 = 32.
MATHEMATICA
Table[Max[Table[DivisorSigma[0, Binomial[n, k]], {k, 0, n}]] - DivisorSigma[ 0, Binomial[n, Floor[n/2]]], {n, 70}] (* Harvey P. Dale, Jul 18 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved