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 A083987 #6 Dec 05 2013 19:56:15 %S A083987 1,5,34,255,2040,17000,145715,1275007,11333396,102000564,927277855, %T A083987 85000470043,784619723474,7285754575116,68000376034416, %U A083987 637503525322650,60000331795072942,566669800286800008,5368450739559157971,510002820258120007246 %N A083987 a(n) = n-th partial concatenation of A051883 divided by n. %Y A083987 Cf. A051883. %K A083987 base,nonn %O A083987 1,2 %A A083987 _Amarnath Murthy_, May 22 2003 %E A083987 Corrected and extended by _Sean A. Irvine_, Sep 25 2011