a(n) = 5^(n*(n-1)/2) + 5^(n*(n+1)/2) for n > 0, with a(0) = 1.
A337971
a(n) = 5^(n*(n-1)/2) + 5^(n*(n+1)/2) for n > 0, with a(0) = 1.
Terms
- a(0) =1a(1) =6a(2) =130a(3) =15750a(4) =9781250a(5) =30527343750
External references
- oeis: A337971
A337971
a(n) = 5^(n*(n-1)/2) + 5^(n*(n+1)/2) for n > 0, with a(0) = 1.