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 A014428 #20 Oct 26 2021 18:30:05
%S A014428 2,4,6,4,10,10,6,20,6,8,28,56,70,56,28,8,36,84,126,126,84,36,10,120,
%T A014428 210,252,210,120,10,330,462,462,330,12,66,220,792,924,792,220,66,12,
%U A014428 78,286,1716,1716,286,78,14,364,2002,3432,2002,364,14,16,120,560,1820
%N A014428 Even elements in Pascal's triangle.
%H A014428 Rémy Sigrist, <a href="/A014428/b014428.txt">Table of n, a(n) for n = 1..10111</a>
%e A014428 Triangle begins:
%e A014428 2
%e A014428 4 6 4
%e A014428 10 10
%t A014428 Select[ Flatten[ Table[ Binomial[ n, i ], {n, 0, 20}, {i, 0, n} ] ], EvenQ[ # ]& ]
%Y A014428 Cf. A007318, A014421, A048967.
%K A014428 nonn,easy,tabf
%O A014428 1,1
%A A014428 _Mohammad K. Azarian_
%E A014428 More terms from _Erich Friedman_
%E A014428 Offset corrected by _Mohammad K. Azarian_, Nov 19 2008