a(n) = Sum_{k=0..n} (k!)^6 * StirlingS2(n,k)^3.A242283a(n) = Sum_{k=0..n} (k!)^6 * StirlingS2(n,k)^3.Terms a(0) =1a(1) =1a(2) =65a(3) =48385a(4) =201202625External referencesoeis: A242283