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 A073430 #3 May 01 2014 02:47:51 %S A073430 1,1,0,0,2,0,1,0,4,0,0,2,4,8,0,0,2,8,16,16,0,0,0,12,40,48,32,0,1,0,12, %T A073430 80,144,128,64,0,0,2,12,136,384,448,320,128,0,0,2,12,224,912,1408, %U A073430 1280,768,256,0,0,0,20,328,2048,4096,4544,3456,1792,512,0,0,2,16,480,4336 %N A073430 Upper triangular region of the table A073346. %p A073430 A073430 := n -> A073346bi(A003056(n), A002262(n)); %p A073430 A002262 := n -> n - binomial(floor((1/2)+sqrt(2*(1+n))),2); %p A073430 A003056 := n -> floor(sqrt(2*(1+n))-(1/2)); %K A073430 nonn,tabl %O A073430 0,5 %A A073430 _Antti Karttunen_, Jul 31 2002