Infraperfect numbers: a(n) = 2^(2*p - 1) - 2^p, where p is A000043(n).

A139096

Infraperfect numbers: a(n) = 2^(2*p - 1) - 2^p, where p is A000043(n).

Terms

    a(0) =4a(1) =24a(2) =480a(3) =8064a(4) =33546240a(5) =8589803520a(6) =137438429184

External references