a(n) = 5*binomial(11*n+5,n)/(11*n+5).

A234871

a(n) = 5*binomial(11*n+5,n)/(11*n+5).

Terms

    a(0) =1a(1) =5a(2) =65a(3) =1110a(4) =21620a(5) =455126a(6) =10085845a(7) =231814440a(8) =5475346305a(9) =132090011900

External references