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 A199206 #10 Oct 30 2018 10:31:02 %S A199206 1,1,2,26,53,365,73,13369,31226,40193,1346393,10982633,59784881, %T A199206 12459674,197301737,4044371993,16335212753,165277755905,33055551181, %U A199206 627510050434,2556360882389,25830314642530,5166062928506,433477841994649,1561599571802482 %N A199206 a(n) = (1+(A034939(n))^2)/5^n. %H A199206 Zak Seidov, <a href="/A199206/b199206.txt">Table of n, a(n) for n = 0..100</a> %e A199206 a(0)=(1+(A034939(0))^2)/5^0=(1+(0)^2)/1=1, %e A199206 a(1)=(1+(A034939(1))^2)/5^1=(1+(2)^2)/5=1, %e A199206 a(2)=(1+(A034939(2))^2)/5^2=(1+(7)^2)/25=2, %e A199206 a(3)=(1+(A034939(3))^2)/5^3=(1+(57)^2)/5^3=3250/125=26. %Y A199206 Cf. A034939. %K A199206 nonn %O A199206 0,3 %A A199206 _Zak Seidov_, Nov 04 2011