a(n) = n! * Sum_{k=0..floor(n/5)} (n/120)^k /(k! * (n-5*k)!).
A362336
a(n) = n! * Sum_{k=0..floor(n/5)} (n/120)^k /(k! * (n-5*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =6a(6) =37a(7) =148a(8) =449a(9) =1135a(10) =15121a(11) =172789a(12) =1207009a(13) =6106816a(14) =24748725a(15) =510855346a(16) =8524169473a(17) =84981641837a(18) =602009065729
External references
- oeis: A362336