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 A083141 #12 Apr 19 2016 01:07:33
%S A083141 2,9,35,91,209,377,629,817,1219,1769,2201,2923,3649,4343,5029,5989,
%T A083141 7729,8479,10117,11573,12629,14299,16019,17711,21631,23129,24617,
%U A083141 26857,28667,30623,35687,38383,42607,44063,50213,52699,56363,60799,63961,68681
%N A083141 Main diagonal of array in A083140.
%F A083141 a(n) = prime(n)*prime(2*n-2).
%t A083141 Table[ Prime[n]*Prime[2n - 2], {n, 2, 41}]
%o A083141 (PARI) vector(50, n, if (n==1, 2, prime(n)*prime(2*n-2))) \\ _Michel Marcus_, Dec 19 2014
%Y A083141 Cf. A083140.
%K A083141 nonn
%O A083141 1,1
%A A083141 _Yasutoshi Kohmoto_, Jun 05 2003
%E A083141 Edited and extended by _Robert G. Wilson v_, Jun 11 2003