19318376

Appears in sequences

• a(n) = (4n-2)*a(n-1)+a(n-2) with a(0)=1 and a(1)=2.at n=7A079165
• Square array read by antidiagonals of T(n,k)=(4k-2)*T(n,k-1)+T(n,k-2) with T(n,0)=1 and T(n,1)=n.at n=47A079166