766941

Appears in sequences

• Number of unrooted quartic trees with 2n (unlabeled) nodes and possessing a bicentroid; number of 2n-carbon alkanes C(2n)H(4n+2) with a bicentroid, ignoring stereoisomers.at n=10A010373
• Triangular numbers k such that phi(k) is also a triangular number, where phi(k) is the Euler totient function (A000010).at n=6A287472