a(0) = 1; a(n) = n^(n-1)(3n-1)/2 (n>0).
A081918
a(0) = 1; a(n) = n^(n-1)(3n-1)/2 (n>0).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =36a(4) =352a(5) =4375a(6) =66096a(7) =1176490a(8) =24117248a(9) =559607373a(10) =14500000000a(11) =414998793616
External references
- oeis: A081918