a(n) = binomial(10*n+5,n)/(2*n+1).

A234528

a(n) = binomial(10*n+5,n)/(2*n+1).

Terms

    a(0) =1a(1) =5a(2) =60a(3) =935a(4) =16555a(5) =316251a(6) =6353760a(7) =132321990a(8) =2830853610a(9) =61841702065

External references