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See A238238 which is the equivalent of this constant in radians.
Stanislav Sykora, Table of n, a(n) for n = 2..2000
Wikipedia, Solid angle
Cf. A001622, A238238.
Sequence in context: A021135 A198374 A225450 * A199437 A021571 A013675
Adjacent sequences: A238236 A238237 A238238 * A238240 A238241 A238242
Stanislav Sykora, Feb 20 2014