A286193 Decimal expansion of Sum_{n>=1} 1/(n^n+n).
7, 0, 4, 1, 8, 8, 3, 4, 9, 9, 2, 3, 3, 1, 4, 7, 1, 8, 1, 7, 1, 2, 6, 2, 0, 0, 0, 4, 4, 2, 2, 1, 8, 5, 7, 8, 0, 3, 0, 4, 1, 5, 8, 5, 3, 7, 7, 2, 9, 0, 9, 4, 4, 5, 0, 7, 4, 2, 2, 2, 3, 4, 0, 3, 8, 6, 1, 3, 9, 0, 6, 9, 3, 8, 2, 4, 0, 7, 7, 6, 1, 5, 5, 9, 0, 4, 5, 6, 8, 5, 6, 2, 3, 5, 3, 0, 5, 6
Offset: 0
Examples
0.70418834992331471817126200044221857803...
Programs
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Mathematica
RealDigits[N[Sum[1/(n^n+n),{n,1,Infinity}],20]][[1]] -
PARI
suminf(n=1, 1/(n^n+n)) \\ Michel Marcus, May 04 2017
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Python
from decimal import *;getcontext().prec=300;print(sum([Decimal(1)/Decimal(n**n+n)for n in range(1,200)]))