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 A055097 #7 Mar 31 2015 03:55:25 %S A055097 2,4,2,2,6,3,4,2,4,2,2,8,6,6,2,6,2,4,4,4,4,4,6,2,10,2,9,2,4,4,12,2,4, %T A055097 6,8,4,2,8,2,6,4,8,2,6,2,4,4,8,2,4,2,8,4,4,4,4,6,6,12,3,18,2,10,9,6,4, %U A055097 8,2,4,4,4,4,4,2,8,2,8,2,2,12,4,6,4,8,6,12,2,8,2,12,4,4,2,12,2,8,6,4,3 %N A055097 Number of divisors for each term in the triangle A055096. It is 2 for primes (all of the form 4k+1). %p A055097 sum2distinct_squares_array := (n) -> (((n-((trinv(n-1)*(trinv(n-1)-1))/2))^2)+((trinv(n-1)+1)^2)); %p A055097 with(numtheory, tau); a(n) = tau(sum2distinct_squares_array(n)) %Y A055097 Cf. A055132. %K A055097 nonn,tabl %O A055097 1,1 %A A055097 _Antti Karttunen_, Apr 04 2000