a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 3, 1, 1, 3.
A025254
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 3, 1, 1, 3.
Terms
- a(0) =3a(1) =1a(2) =1a(3) =3a(4) =10a(5) =34a(6) =118a(7) =417a(8) =1497a(9) =5448a(10) =20063a(11) =74649a(12) =280252a(13) =1060439a(14) =4040413a(15) =15488981a(16) =59701236a(17) =231236830a(18) =899559100a(19) =3513314664a(20) =13770811198a(21) =54152480421a(22) =213585706927a(23) =844723104691
External references
- oeis: A025254