1,2
Also the vertex solid angle of a regular octahedron.
Stanislav Sykora, Table of n, a(n) for n = 1..2000
Eric Weisstein's World of Mathematics, Cuboctahedron
Eric Weisstein's World of Mathematics, Spherical Polygon
Wikipedia, Platonic solid
4*arcsin(1/3).
2*Pi - 4*arcsin(2*sqrt(2)/3). - Bradley Klee, Oct 04 2018
8*A236555 + 6*A236556 = 4*Pi. - Bradley Klee, Oct 04 2018
1.35934763781648774838557005356705626555297876132983228572769584995966...
(PARI) 4*asin(1/3)
Cf. A236555. Icosidodecahedron: A319881, A319883. Vertex Angles: A019669, A236557, A236558.
Sequence in context: A303772 A200510 A138055 * A189044 A299793 A199612
Adjacent sequences: A236553 A236554 A236555 * A236557 A236558 A236559
nonn,cons,easy
Stanislav Sykora, Jan 28 2014
Definition corrected by Bradley Klee, Oct 04 2018
approved