a(n) = 3^n + 2^(3*n + 1) - 2^(2*n + 1).
A377641
a(n) = 3^n + 2^(3*n + 1) - 2^(2*n + 1).
Terms
- a(0) =11a(1) =105a(2) =923a(3) =7761a(4) =63731a(5) =516825a(6) =4163723a(7) =33429921a(8) =267930851a(9) =2145445545a(10) =17171657723a(11) =137405930481
External references
- oeis: A377641