Approximation of the 2-adic integer exp(-4) up to 2^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =5a(4) =5a(5) =5a(6) =5a(7) =5a(8) =133a(9) =389a(10) =901a(11) =1925a(12) =3973a(13) =8069a(14) =8069a(15) =24453a(16) =57221a(17) =57221a(18) =188293a(19) =450437a(20) =974725a(21) =974725a(22) =974725a(23) =974725a(24) =974725a(25) =17751941a(26) =17751941a(27) =84860805a(28) =84860805a(29) =84860805