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 A111428 #8 Nov 07 2018 20:13:17 %S A111428 0,0,0,0,0,0,1,2,24,3136,29249425,2544489349890656, %T A111428 10469303814509319059584520878072, %U A111428 52390584919058211443518140875804297526718993867687450278537778 %N A111428 Tribonacci(pentanacci(n)). %H A111428 Alois P. Heinz, <a href="/A111428/b111428.txt">Table of n, a(n) for n = 0..17</a> %F A111428 a(n) = A000073(A001591(n)). %p A111428 a:= n-> (<<0|1|0>, <0|0|1>, <1|1|1>>^((<<0|1|0|0|0>, %p A111428 <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]: %p A111428 seq(a(n), n=0..12); # _Alois P. Heinz_, Nov 07 2018 %Y A111428 Cf. A000045, A000073, A001591, A007570. %K A111428 easy,nonn %O A111428 0,8 %A A111428 _Jonathan Vos Post_, Nov 13 2005