a(n) = sqrt(2)*( (3+2*sqrt(2))^n - (3-2*sqrt(2))^n ).
A081554
a(n) = sqrt(2)*( (3+2*sqrt(2))^n - (3-2*sqrt(2))^n ).
Terms
- a(0) =0a(1) =8a(2) =48a(3) =280a(4) =1632a(5) =9512a(6) =55440a(7) =323128a(8) =1883328a(9) =10976840a(10) =63977712a(11) =372889432a(12) =2173358880a(13) =12667263848a(14) =73830224208a(15) =430314081400
External references
- oeis: A081554