a(n) = denominator((1/2)*(1 + Product_{k=0..n-1} 2*(1 + 3*k)/(5 + 6*k))).

A146753

a(n) = denominator((1/2)*(1 + Product_{k=0..n-1} 2*(1 + 3*k)/(5 + 6*k))).

Terms

    a(0) =1a(1) =10a(2) =110a(3) =1870a(4) =8602a(5) =249458a(6) =1247290a(7) =51138890a(8) =218502530a(9) =2316126818a(10) =136651482262a(11) =136651482262a(12) =570720896506

External references