Expansion of (1+4x)/AGM(1+4x,1-4x) where AGM denotes the arithmetic-geometric mean.

A092266

Expansion of (1+4x)/AGM(1+4x,1-4x) where AGM denotes the arithmetic-geometric mean.

Terms

    a(0) =1a(1) =4a(2) =4a(3) =16a(4) =36a(5) =144a(6) =400a(7) =1600a(8) =4900a(9) =19600a(10) =63504a(11) =254016a(12) =853776a(13) =3415104a(14) =11778624a(15) =47114496a(16) =165636900a(17) =662547600a(18) =2363904400a(19) =9455617600a(20) =34134779536a(21) =136539118144a(22) =497634306624

External references