A370012 Decimal expansion of Sum_{k>=0} (-1)^k / (k^2 + k)!.

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

Offset

0,1

Links

Table of n, a(n) for n=0..85.

Formula

(Constant in A370013) - (this constant) = 1.0000000041753513975736197...

Example

0.501388886801213190513110753299...

Mathematica

s[x_] := s[x] = Sum[x^n/((n^2 + n)!), {n, 0, Infinity}]
First[RealDigits[N[s[-1], 100]]]

Crossrefs

Cf. A370013.

Sequence in context: A261851 A117015 A325736 * A370013 A334364 A174859

Adjacent sequences: A370009 A370010 A370011 * A370013 A370014 A370015

Keyword

nonn,cons

Author

Clark Kimberling, Apr 04 2024

Status

approved