140752

Appears in sequences

• Janet periodic table of the elements and structured hexagonal diamond numbers. a(n) = A166911(2*n) + A166911(2*n+1).at n=18A167471
• Number of 7-step self-avoiding walks on an n X n square summed over all starting positions.at n=15A188152
• Composite numbers k such that k*phi(k) is in A002378.at n=28A256545
• G.f. satisfies A(x) = 1/(1-x) + x^3*(1-x)*A(x)^3.at n=20A364595