a(n) is the least positive integer such that the integer part of the arithmetic-geometric mean of a(n) and 1 is equal to 2^n.

A090855

a(n) is the least positive integer such that the integer part of the arithmetic-geometric mean of a(n) and 1 is equal to 2^n.

Terms

    a(0) =1a(1) =4a(2) =10a(3) =24a(4) =55a(5) =127a(6) =288a(7) =640a(8) =1408a(9) =3069a(10) =6642a(11) =14281a(12) =30544a(13) =65028a(14) =137896a(15) =291399a(16) =613885a(17) =1289715a(18) =2702909a(19) =5652038a(20) =11795170a(21) =24570079a(22) =51095155a(23) =106092067a(24) =219972452a(25) =455493427a(26) =942031726a(27) =1946056082a(28) =4015916211

External references