Second differences of Mersenne numbers A001348.
A139241
Second differences of Mersenne numbers A001348.
Terms
- a(0) =20a(1) =72a(2) =1824a(3) =4224a(4) =116736a(5) =270336a(6) =7471104a(7) =520617984a(8) =1082130432a(9) =133680857088
External references
- oeis: A139241