a(n) = (n+1) * A005493(n).

Terms

a(0) =1a(1) =6a(2) =30a(3) =148a(4) =755a(5) =4044a(6) =22841a(7) =136056a(8) =853452a(9) =5625950a(10) =38885297a(11) =281170080a(12) =2122313505a(13) =16688829122a(14) =136457754030