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 A106246 #8 Jan 28 2016 15:06:21
%S A106246 1,2,1,1,4,1,0,3,6,1,0,0,6,8,1,0,0,0,10,10,1,0,0,0,0,15,12,1,0,0,0,0,
%T A106246 0,21,14,1,0,0,0,0,0,0,28,16,1,0,0,0,0,0,0,0,36,18,1,0,0,0,0,0,0,0,0,
%U A106246 45,20,1,0,0,0,0,0,0,0,0,0,55,22,1,0,0,0,0,0,0,0,0,0,0,66,24,1,0,0,0,0,0,0
%N A106246 Number triangle T(n,k)=C(n,k)C(2,n-k).
%C A106246 Row sums are C(n+2,2)=A000217(n+1). Diagonal sums are A106247. Subdiagonal is 2(n+1)=A005843(n+1). Second subdiagonal is A000217(n+1).
%H A106246 Harvey P. Dale, <a href="/A106246/b106246.txt">Table of n, a(n) for n = 0..1000</a>
%F A106246 T(n,k)=A007318*A167194. [From _Mats Granvik_, Oct 30 2009]
%e A106246 Triangle begins
%e A106246 1;
%e A106246 2,1;
%e A106246 1,4,1;
%e A106246 0,3,6,1;
%e A106246 0,0,6,8,1;
%e A106246 0,0,0,10,10,1;
%t A106246 Flatten[Table[Binomial[n,k]Binomial[2,n-k],{n,0,20},{k,0,n}]] (* _Harvey P. Dale_, Jan 28 2016 *)
%Y A106246 Cf. A007318, A167194. [From _Mats Granvik_, Oct 30 2009]
%K A106246 easy,nonn,tabl
%O A106246 0,2
%A A106246 _Paul Barry_, Apr 26 2005