a(n) = numerator(6 * Sum_{k=2..n} 1/(binomial(2*k, k)*(k-1))).

A145566

a(n) = numerator(6 * Sum_{k=2..n} 1/(binomial(2*k, k)*(k-1))).

Terms

    a(0) =1a(1) =23a(2) =33a(3) =199a(4) =10957a(5) =11873a(6) =35621a(7) =4844519a(8) =2789277a(9) =2789279a(10) =705687707a(11) =1764219339a(12) =3175594841a(13) =26312071601a(14) =79968060793a(15) =479808364823

External references