A371219 Decimal expansion of Product_{k>=1} (1 - 1/(2*k+1)^4).
9, 8, 5, 3, 5, 2, 0, 8, 4, 3, 8, 7, 2, 2, 0, 6, 2, 3, 3, 0, 3, 4, 9, 1, 1, 1, 3, 7, 9, 0, 6, 4, 8, 6, 7, 7, 1, 2, 1, 5, 9, 2, 5, 6, 3, 5, 6, 6, 8, 2, 8, 6, 3, 8, 6, 5, 3, 7, 8, 4, 8, 7, 8, 8, 8, 5, 1, 8, 5, 1, 4, 1, 2, 1, 3, 8, 2, 5, 6, 5, 2, 8, 6, 7, 9, 1, 3, 7, 8, 0, 8, 0, 6, 1, 5, 7, 8, 7, 5, 0
Offset: 0
Examples
0.98535208438722062330349111379064867712159256...
Programs
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Mathematica
RealDigits[(1/8) Pi Cosh[Pi/2], 10, 100][[1]]
Formula
Equals (1/8) * Pi * cosh(Pi/2).