a(n) = 1 + L(n) + F(2*n-1) with {L(n)}_{n>=0} the Lucas numbers (A000032) and F(2*n-1)_{n>=0} the bisected Fibonacci numbers (A001519).
A005522
a(n) = 1 + L(n) + F(2*n-1) with {L(n)}_{n>=0} the Lucas numbers (A000032) and F(2*n-1)_{n>=0} the bisected Fibonacci numbers (A001519).
Terms
- a(0) =4a(1) =3a(2) =6a(3) =10a(4) =21a(5) =46a(6) =108a(7) =263a(8) =658a(9) =1674a(10) =4305a(11) =11146a(12) =28980a(13) =75547a(14) =197262a(15) =515594a(16) =1348477a(17) =3528150a(18) =9233244a(19) =24167167a(20) =63261114a(21) =165604618a(22) =433534041a(23) =1134967250a(24) =2971318756a(25) =7778909811a(26) =20365282518a(27) =53316730378a(28) =139584573093a(29) =365436446014
External references
- oeis: A005522