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 A102428 #8 Mar 13 2015 16:42:38
%S A102428 1,3,6,28,55,286,560,3060,5985,33649,65780,376740,736281,4272048,
%T A102428 8347680,48903492,95548245,563921995,1101716330,6540715896,
%U A102428 12777711870,76223753060,148902215280,891794789340,1742058970275,10468434365991
%N A102428 Central column of triangle A102427.
%F A102428 a(n) = binomial(floor((5*n+2)/2), floor((n+1)/2)). - _David Wasserman_, Apr 04 2008
%t A102428 Table[Binomial[Floor[(5n+2)/2],Floor[(n+1)/2]],{n,0,30}] (* _Harvey P. Dale_, Mar 13 2015 *)
%Y A102428 Cf. A011973, A102426, A102427, A102429.
%K A102428 nonn
%O A102428 0,2
%A A102428 _Russell Walsmith_, Jan 11 2005
%E A102428 More terms from _David Wasserman_, Apr 04 2008