a(n) = ((2 + 3*sqrt(2))^n - (2 - 3*sqrt(2))^n)/(2*sqrt(2)).
A124191
a(n) = ((2 + 3*sqrt(2))^n - (2 - 3*sqrt(2))^n)/(2*sqrt(2)).
Terms
- a(0) =0a(1) =3a(2) =12a(3) =90a(4) =528a(5) =3372a(6) =20880a(7) =130728a(8) =815232a(9) =5091120a(10) =31777728a(11) =198386592a(12) =1238434560a(13) =7731150528a(14) =48262685952a(15) =301286851200
External references
- oeis: A124191