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 A320989 #4 Oct 25 2018 20:46:19 %S A320989 0,1,7,50,2457,842801,14164958864,81658169024988865, %T A320989 7911779188478711198209076919, %U A320989 4419091543264985265125879423229594334610523298,239147782774557159658813554446871692442583155391399547503168277134702036921 %N A320989 Fibonacci rabbit sequence number n coded in base seven. %H A320989 Alois P. Heinz, <a href="/A320989/b320989.txt">Table of n, a(n) for n = 0..15</a> %p A320989 b:= proc(n) option remember; `if`(n<2, [n$2], [b(n-1)[1]* %p A320989 7^b(n-1)[2]+b(n-2)[1], b(n-1)[2]+b(n-2)[2]]) %p A320989 end: %p A320989 a:= n-> b(n)[1]: %p A320989 seq(a(n), n=0..11); %Y A320989 Column k=7 of A144287. %K A320989 nonn %O A320989 0,3 %A A320989 _Alois P. Heinz_, Oct 25 2018