a(n) = Lucas(4*n+1) + 1, or Lucas(2*n)*Lucas(2*n+1).
A081014
a(n) = Lucas(4*n+1) + 1, or Lucas(2*n)*Lucas(2*n+1).
Terms
- a(0) =2a(1) =12a(2) =77a(3) =522a(4) =3572a(5) =24477a(6) =167762a(7) =1149852a(8) =7881197a(9) =54018522a(10) =370248452a(11) =2537720637a(12) =17393796002a(13) =119218851372a(14) =817138163597
External references
- oeis: A081014