This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A111430 #3 Mar 30 2012 18:40:29 %S A111430 0,0,1,2,24,3136,53798080,15832480722303616, %T A111430 745527911414639917440582097294401, %U A111430 1653079675982713719400420113305863285438472194540328413077493166464 %N A111430 Tribonacci(heptanacci(n)). %F A111430 a(n) = A000073(A066178(n)). %e A111430 Heptanacci(10) = A066178(10) = 504, so tribonacci(heptanacci(10)) = %e A111430 A000073(504) ~ 4.4 * 10^133. %Y A111430 Cf. A000073, A066178, A007570. %K A111430 easy,nonn %O A111430 0,4 %A A111430 _Jonathan Vos Post_, Nov 13 2005