0,3
Volume of regular tetrahedron with unit edge. - Stanislav Sykora, May 31 2012
Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Tetrahedron
Wikipedia, Platonic solid
0.117851130197757920733474...
RealDigits[sqrt(2)/12, 10, 50][[1]] (* G. C. Greubel, Jul 06 2017 *)
(PARI) sqrt(2)/12 \\ G. C. Greubel, Jul 06 2017
Cf. A131594 (regular octahedron volume), A102208 (regular icosahedron volume), A102769 (regular dodecahedron volume).
Sequence in context: A256920 A195340 A019794 * A109916 A277053 A076415
Adjacent sequences: A020826 A020827 A020828 * A020830 A020831 A020832
nonn,cons
N. J. A. Sloane
approved