For even n, a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n); for odd n, the least integer such that a(n+2)/a(n+1) > a(n+1)/a(n); a(0) = 4, a(1) = 16.

A022030

For even n, a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n); for odd n, the least integer such that a(n+2)/a(n+1) > a(n+1)/a(n); a(0) = 4, a(1) = 16.

Terms

    a(0) =4a(1) =16a(2) =63a(3) =249a(4) =984a(5) =3889a(6) =15370a(7) =60745a(8) =240075a(9) =948819a(10) =3749901a(11) =14820274a(12) =58572352a(13) =231488326a(14) =914882931a(15) =3615779646a(16) =14290202610a(17) =56477415835a(18) =223208766625a(19) =882160643536

External references