a(n) = binomial(8*n+4,n)/(2*n+1).

A234463

a(n) = binomial(8*n+4,n)/(2*n+1).

Terms

    a(0) =1a(1) =4a(2) =38a(3) =468a(4) =6545a(5) =98728a(6) =1566040a(7) =25747128a(8) =434824104a(9) =7498246100a(10) =131477423220

External references