a(n) = (F(3n) + F(n))/3, where F = A000045 (the Fibonacci sequence).
A049673
a(n) = (F(3n) + F(n))/3, where F = A000045 (the Fibonacci sequence).
Terms
- a(0) =0a(1) =1a(2) =3a(3) =12a(4) =49a(5) =205a(6) =864a(7) =3653a(8) =15463a(9) =65484a(10) =277365a(11) =1174889a(12) =4976832a(13) =21082073a(14) =89304891a(15) =378301260a(16) =1602509321a(17) =6788337557a(18) =28755857952a(19) =121811766781a(20) =516002920895
External references
- oeis: A049673