a(n) = 2*5^n - (1+2i)^(2n) - (1-2i)^(2n) where i = sqrt(-1).
A250102
a(n) = 2*5^n - (1+2i)^(2n) - (1-2i)^(2n) where i = sqrt(-1).
Terms
- a(0) =0a(1) =16a(2) =64a(3) =16a(4) =2304a(5) =5776a(6) =7744a(7) =309136a(8) =451584a(9) =2062096a(10) =38837824a(11) =27920656a(12) =424030464a(13) =4570300816a(14) =1039933504a(15) =74815378576a(16) =501671890944a(17) =2396689936
External references
- oeis: A250102