a(n) = A107672(n)/(n+1)^3.A107673a(n) = A107672(n)/(n+1)^3.Terms a(0) =1a(1) =1a(2) =19a(3) =1279a(4) =190769a(5) =50664371a(6) =21139541089External referencesoeis: A107673