a(n) = 10*binomial(11*n+10,n)/(11*n+10).

A235340

a(n) = 10*binomial(11*n+10,n)/(11*n+10).

Terms

    a(0) =1a(1) =10a(2) =155a(3) =2870a(4) =58565a(5) =1270752a(6) =28765650a(7) =671650110a(8) =16057800980a(9) =391139588190

External references