a(n) = (A093886(n))! / (1!*2!*3!*...*n!).

A093887

a(n) = (A093886(n))! / (1!*2!*3!*...*n!).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =140a(4) =105a(5) =840840a(6) =51051a(7) =79755701025

External references