A091132 Decimal expansion of e^2 - 2e.

1, 9, 5, 2, 4, 9, 2, 4, 4, 2, 0, 1, 2, 5, 5, 9, 7, 5, 6, 5, 0, 9, 8, 5, 2, 5, 1, 7, 8, 6, 9, 6, 8, 2, 8, 1, 7, 6, 6, 5, 8, 2, 1, 3, 8, 3, 1, 5, 1, 9, 2, 8, 1, 7, 4, 1, 5, 3, 1, 9, 2, 5, 6, 7, 0, 7, 4, 4, 2, 0, 5, 3, 5, 3, 7, 1, 9, 6, 2, 5, 7, 4, 2, 4, 1, 5, 4, 8, 1, 2, 8, 0, 2, 8, 7, 8, 8, 9, 3, 9, 9, 1

Offset

1,2

Comments

Average length of the 2nd increasing run in a random permutation of n integers as n->Infinity.

Links

Table of n, a(n) for n=1..102.

Eric Weisstein's World of Mathematics, Permutation

Formula

Equals (Sum_{n>0}(Sum_{k>0} 1/(n!*k!)))-1. - Fredrik Johansson, Apr 21 2006

Example

-2*e + e^2 = 1.95249244...

Mathematica

RealDigits[E^2-2*E, 10, 120][[1]] (* Harvey P. Dale, Nov 04 2019 *)

Crossrefs

Sequence in context: A020827 A154971 A021109 * A155165 A199061 A346573

Adjacent sequences: A091129 A091130 A091131 * A091133 A091134 A091135

Keyword

nonn,cons,easy

Author

Eric W. Weisstein, Dec 19 2003

Status

approved