A139473 a(n)=((2*Sqrt[2] + 3)^(2^(n - 1) - 1) - (3 - 2*Sqrt[2])^(2^(n - 1) - 1))/(4*Sqrt[2]).

0, 1, 35, 40391, 53789260175, 95393218491883573553951, 300027707381709879256191290532493317737977820735

Offset

1,3

Links

Table of n, a(n) for n=1..7.

Mathematica

Table[Expand[((2*Sqrt[2] + 3)^(2^(n - 1) - 1) - (3 - 2*Sqrt[2])^(2^(n - 1) - 1))/(4*Sqrt[2])], {n, 1, 10}] (*Artur Jasinski*)

Crossrefs

Cf. A001109, A139474, A139475, A139476.

Sequence in context: A249890 A285388 A212926 * A110596 A286178 A126029

Adjacent sequences: A139470 A139471 A139472 * A139474 A139475 A139476

Keyword

nonn

Author

Artur Jasinski, Apr 22 2008

Status

approved