A111425 a(n) = tribonacci(Fibonacci(n)).

0, 0, 0, 1, 1, 4, 24, 504, 66012, 181997601, 65720971788709, 65431225571591367370292, 23523635785731871586396890786299881280, 8419860898569880503664421048610377961601349941695806840602396

Offset: 0

Author

Jonathan Vos Post, Nov 13 2005

Keywords

• easy
• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..18

Crossrefs

Cf. A000045, A000073, A007570, A111431.

Programs

Maple

a:= n-> (<<0|1|0>, <0|0|1>, <1|1|1>>^((<<0|1>, <1|1>>^n)[1, 2]))[1, 3]:
seq(a(n), n=0..14);  # Alois P. Heinz, Aug 09 2018

Formula

a(n) = A000073(A000045(n)).