a(n) = 5*a(n-1) - 4*a(n-3) for n >= 4, where a(1) = 1, a(2) = 3, a(3) = 13.

A341250

a(n) = 5*a(n-1) - 4*a(n-3) for n >= 4, where a(1) = 1, a(2) = 3, a(3) = 13.

Terms

    a(0) =1a(1) =3a(2) =13a(3) =61a(4) =293a(5) =1413a(6) =6821a(7) =32933a(8) =159013a(9) =767781a(10) =3707173a(11) =17899813a(12) =86427941a(13) =417311013a(14) =2014955813a(15) =9729067301a(16) =46976092453a(17) =226820639013

External references