A051191 a(n) = 2^(2^n-2).

1, 4, 64, 16384, 1073741824, 4611686018427387904, 85070591730234615865843651857942052864, 28948022309329048855892746252171976963317496166410141009864396001978282409984

Offset

1,2

Comments

The next term, a(9), has 154 digits. - Harvey P. Dale, Apr 13 2012

Links

Michael De Vlieger, Table of n, a(n) for n = 1..11

Delbrin Ahmed, On subuniverses of lattices and semilattices, Ph. D. Thesis, Univ. of Szeged (Hungary, 2022).

Mathematica

2^(2^Range[9]-2) (* Harvey P. Dale, Apr 13 2012 *)

Crossrefs

Sequence in context: A211214 A229867 A362383 * A120581 A146520 A030176

Adjacent sequences: A051188 A051189 A051190 * A051192 A051193 A051194

Keyword

nonn,easy

Author

Matt Kasper (matt192837(AT)hotmail.com)

Extensions

a(8) from Harvey P. Dale, Apr 13 2012

Status

approved