a(n) = (1/4) * Sum_{k>=0} (3/4)^k * Stirling2(n+k,k).

A390892

a(n) = (1/4) * Sum_{k>=0} (3/4)^k * Stirling2(n+k,k).

Terms

    a(0) =1a(1) =12a(2) =480a(3) =31872a(4) =2961408a(5) =353722368a(6) =51635159040

External references