A111428 Tribonacci(pentanacci(n)).

0, 0, 0, 0, 0, 0, 1, 2, 24, 3136, 29249425, 2544489349890656, 10469303814509319059584520878072, 52390584919058211443518140875804297526718993867687450278537778

Offset: 0

Author

Jonathan Vos Post, Nov 13 2005

Keywords

• easy
• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..17

Crossrefs

Cf. A000045, A000073, A001591, A007570.

Programs

Maple

a:= n-> (<<0|1|0>, <0|0|1>, <1|1|1>>^((<<0|1|0|0|0>,
        <0|0|1|0|0>, <0|0|0|1|0>, <0|0|0|0|1>, <1|1|1|1|1>>^n)[1, 5]))[1, 3]:
seq(a(n), n=0..12);  # Alois P. Heinz, Nov 07 2018

Formula

a(n) = A000073(A001591(n)).