a(n) = (n^(n+1)-(n-1)^n) + ((n+1)^n-n^(n-1)).
A258389
a(n) = (n^(n+1)-(n-1)^n) + ((n+1)^n-n^(n-1)).
Terms
- a(0) =2a(1) =14a(2) =128a(3) =1504a(4) =21752a(5) =374184a(6) =7464368a(7) =169402496a(8) =4309519952a(9) =121450640200
External references
- oeis: A258389