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 A107103 #6 May 10 2013 12:45:42
%S A107103 1,-3,12,-67,495,-4596,51583,-680037,10306152,-176591665,3376207461,
%T A107103 -71258869848,1645797382177,-41289185878227,1118136109703460,
%U A107103 -32509366699961371,1010047705084550823,-33397162601828122332,1170937325957822375167,-43391988679237460897205
%N A107103 Column 1 of triangle A107102, which is the matrix inverse of A100862.
%C A107103 Column 0 of triangle A107102 is signed A001515 (Bessel polynomial).
%F A107103 |a(n)| = 2*A001515(n)-A001515(n-1). - _Vladeta Jovovic_, Aug 10 2006
%o A107103 (PARI) {a(n)=local(X=x+x^2*O(x^n),Y=y+y^2*O(y^n));(matrix(n+2,n+2,m,k,if(m>=k, (m-1)!*polcoeff(polcoeff(exp(X+Y*X^2/2+X*Y),m-1,x),k-1,y)))^-1)[n+2,2]}
%Y A107103 Cf. A100862, A001515, A043301, A107102, A107104.
%K A107103 sign
%O A107103 0,2
%A A107103 _Paul D. Hanna_, May 21 2005