A371745 - OEIS

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A371745

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

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

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

FORMULA

Equals 2 - cos(1) - 2 sin(1).

EXAMPLE

-0.2232442754839327307059412507035746029774...

MATHEMATICA

s = Sum[(-1)^k k/((k + 1) (2 k)!), {k, 0, Infinity}]

d = N[s, 100]