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 A056136 #4 Mar 30 2012 18:51:27 %S A056136 1,2,6,6,15,12,28,20,45,30,66,42,91,56,120,72,153,90,190,110,231,132, %T A056136 276,156,325,182,378,210,435,240,496,272,561,306,630,342,703,380,780, %U A056136 420,861,462,946,506,1035,552,1128,600,1225,650,1326,702,1431,756,1540 %N A056136 Largest positive integer whose harmonic mean with another positive integer is n. %F A056136 a(n) =1/(2/n-1/floor[n/2+1]) =n*A008619(n)/(2*A008619(n)-n) =(n/2)*A029578(n+2) %Y A056136 Cf. A008619 for the smallest integer whose harmonic mean with another integer is n (i.e. harmonic mean of A008619 and a(n) is n). %K A056136 nonn %O A056136 1,2 %A A056136 _Henry Bottomley_, Jun 13 2000