0,1

Table of n, a(n) for n=0..104.

Eric Weisstein's World of Mathematics, 30-60-90 Triangle

Eric Weisstein's World of Mathematics, Triangle Line Picking

(204 + 36*sqrt(3) + 81*log(3) + 2*(9 + 8*sqrt(3))*log(2 + sqrt(3)))/1440.

0.28857171834839485625...

Sequence in context: A197385 A010596 A131920 * A155739 A197139 A198367

Adjacent sequences: A180305 A180306 A180307 * A180309 A180310 A180311

nonn,cons

Eric W. Weisstein, Aug 25 2010

approved