OEIS/Cheat sheet
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PARI
for(n=0,10,for(k=0,n,print1(",",T(n,k)));print()) \\ Print triangle T(n,k)
Maple
ode:=algtorec(x^2*(1+x^2)*A^2-(1+x^2+x^4)*A+1+x^2,A,x,n,N); OperToRecEq(ode,n,N,a);
for(n=0,10,for(k=0,n,print1(",",T(n,k)));print()) \\ Print triangle T(n,k)
ode:=algtorec(x^2*(1+x^2)*A^2-(1+x^2+x^4)*A+1+x^2,A,x,n,N); OperToRecEq(ode,n,N,a);