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 A213452 N1761 #8 Jan 03 2014 16:01:42 %S A213452 0,0,1,6,35,221,1554,12108,104293,986452,10186669,114173261, %T A213452 1381606490,17963133122,249838334627,3702507093782,58255992451047, %U A213452 970036965428901,17043762930794782,315148172259643152,6117607922562556061,124394868793682972996 %N A213452 A001251(n)/2. %D A213452 F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied Tables, Cambridge, 1966, p. 262. (Terms for n>=13 are incorrect). %D A213452 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %Y A213452 Cf. A001251. %K A213452 nonn %O A213452 1,4 %A A213452 _N. J. A. Sloane_, Jun 12 2012