220938240

Appears in sequences

• Reciprocal Chebyshev polynomial of second kind evaluated at 4 multiplied by (-1)^n.at n=14A025171
• Graham-Sloane-type lower bound on the size of a ternary (n,3,9) constant-weight code.at n=23A030509
• a(n) = 4^n sin(nC)/sqrt(15), where B is the angle opposite side CA in a triangle ABC having sidelengths |BC|=2, |CA| = 3, |AB| = 4; ABC is the smallest integer-sided scalene triangle.at n=15A375885