A068532 a(n)=(5^(2^n)-1)/2^(n+2)/3.

1, 13, 4069, 794728597, 60632980118195215861, 705860789378583615890268750566368301709493, 191323950329148357416786545771849882457465097130873620037231723027086142489376167456309

Offset

1,2

Links

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

Crossrefs

Sequence in context: A070905 A180768 A330905 * A182348 A094316 A270068

Adjacent sequences: A068529 A068530 A068531 * A068533 A068534 A068535

Keyword

easy,nonn

Author

Benoit Cloitre, Mar 22 2002

Status

approved