a(n) = (F(4*n) - F(n))/2, where F=A000045 (the Fibonacci sequence).
A049672
a(n) = (F(4*n) - F(n))/2, where F=A000045 (the Fibonacci sequence).
Terms
- a(0) =0a(1) =1a(2) =10a(3) =71a(4) =492a(5) =3380a(6) =23180a(7) =158899a(8) =1089144a(9) =7465159a(10) =51167050a(11) =350704322a(12) =2403763416a(13) =16475639933a(14) =112925716670a(15) =774004377655
External references
- oeis: A049672