a(1) = 9, a(2) = 44, a(n) = 4*(a(n-1) + a(n-2)) (n >=3).
A228603
a(1) = 9, a(2) = 44, a(n) = 4*(a(n-1) + a(n-2)) (n >=3).
Terms
- a(0) =9a(1) =44a(2) =212a(3) =1024a(4) =4944a(5) =23872a(6) =115264a(7) =556544a(8) =2687232a(9) =12975104a(10) =62649344a(11) =302497792a(12) =1460588544a(13) =7052345344a(14) =34051735552a(15) =164416323584a(16) =793872236544
External references
- oeis: A228603