a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 3, -2, 1, 3.

A025261

a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 3, -2, 1, 3.

Terms

    a(0) =3a(1) =-2a(2) =1a(3) =3a(4) =7a(5) =16a(6) =40a(7) =111a(8) =327a(9) =984a(10) =2984a(11) =9120a(12) =28156a(13) =87830a(14) =276442a(15) =876443a(16) =2795523a(17) =8963668a(18) =28877692a(19) =93433104a(20) =303474772a(21) =989159058a(22) =3234373630a(23) =10606540108a(24) =34874855416a(25) =114951540690a(26) =379751773694

External references