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 A086228 #12 Sep 08 2022 08:45:11
%S A086228 1,3,15,140,2520,88704,6150144,843448320,229417943040,123987652771840,
%T A086228 133311524260282368,285432092670742757376,1217843595395169098137600,
%U A086228 10360289146303272377017958400,175805226564926843718814452940800
%N A086228 Determinant of n X n matrix M(i,j)=binomial(2i+1, j).
%H A086228 G. C. Greubel, <a href="/A086228/b086228.txt">Table of n, a(n) for n = 0..80</a>
%F A086228 a(n) = 2^(n*(n-3)/2)*(n+1)*binomial(2*n+1, n)
%t A086228 Table[2^(n*(n-3)/2)*(n+1)*Binomial[2*n+1, n], {n,0,30}] (* _G. C. Greubel_, Jan 25 2018 *)
%o A086228 (PARI) for(n=0, 30, print1(2^(n*(n-3)/2)*(n+1)*binomial(2*n+1, n), ", ")) \\ _G. C. Greubel_, Jan 25 2018
%o A086228 (Magma) [2^(n*(n-3)/2)*(n+1)*Binomial(2*n+1, n): n in [0..30]]; // _G. C. Greubel_, Jan 25 2018
%Y A086228 Cf. A001803.
%K A086228 nonn
%O A086228 0,2
%A A086228 _Benoit Cloitre_, Aug 28 2003