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Tribonacci(heptanacci(n)).
0

%I #3 Mar 30 2012 18:40:29

%S 0,0,1,2,24,3136,53798080,15832480722303616,

%T 745527911414639917440582097294401,

%U 1653079675982713719400420113305863285438472194540328413077493166464

%N Tribonacci(heptanacci(n)).

%F a(n) = A000073(A066178(n)).

%e Heptanacci(10) = A066178(10) = 504, so tribonacci(heptanacci(10)) =

%e A000073(504) ~ 4.4 * 10^133.

%Y Cf. A000073, A066178, A007570.

%K easy,nonn

%O 0,4

%A _Jonathan Vos Post_, Nov 13 2005