1683218

Appears in sequences

• a(n) = Sum_{k=0..7} binomial(n,k).at n=28A008860
• a(n) = Sum_{k=0..n} binomial(4*n,k).at n=7A066381
• a(n) = Sum_{k=0..n} C(n*(n+1)/2,k).at n=7A066383