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 A068359 #17 Sep 06 2022 14:37:16
%S A068359 1,12870,184756,10400600,155117520,137846528820,126410606437752,
%T A068359 1946939425648112,118264581564861424,1832624140942590534,
%U A068359 112186277816662845432,1746130564335626209832,107507208733336176461620,1678910486211891090247320,103827421287553411369671120
%N A068359 Binomial(2k,k) when the first digit of binomial(2k,k) is 1.
%t A068359 a={}; kmax=40; For[k=0, k<=kmax, k++, If[First[IntegerDigits[term = Binomial[2k, k]]]==1, AppendTo[a, term]]]; a (* _Stefano Spezia_, Sep 06 2022 *)
%Y A068359 Intersection of A000984 and A131835.
%Y A068359 Cf. A068358 (k values).
%K A068359 easy,nonn,base
%O A068359 1,2
%A A068359 _Benoit Cloitre_, Feb 28 2002
%E A068359 a(1) = 1 inserted by _Stefano Spezia_, Sep 06 2022