OFFSET
0,2
EXAMPLE
a(0)= 1.
a(4)= 1 + 2 + 6 + 2 + 1 = 12.
MATHEMATICA
Table[Total[Table[GCD[Binomial[n, j], Binomial[n, Floor[n/2]]], {j, 0, n}]], {n, 0, 50}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Jacques ALARDET, Dec 12 2011
STATUS
approved