A068534 a(n)=(7^(2^n)-1)/2^(n+2)/150.

1, 1201, 3461763601, 57522274700204200328401, 31764596032183221357775361004244057832177481618001, 19372599572885568957165529710172832947035894754619777993470030014145668169574231766337989087612412837201

Offset

2,2

Links

Table of n, a(n) for n=2..7.

Crossrefs

Sequence in context: A214116 A221451 A133142 * A252340 A230838 A210015

Adjacent sequences: A068531 A068532 A068533 * A068535 A068536 A068537

Keyword

easy,nonn

Author

Benoit Cloitre, Mar 22 2002

Status

approved