102425

Appears in sequences

• Centered octahedral numbers (crystal ball sequence for cubic lattice).at n=42A001845
• Numbers k such that phi(k) is equal to A008473(k-1).at n=15A039780
• Expansion of x^4 / ((x+1)*(2*x^3-2*x^2-2*x+1)*(x-1)^2).at n=16A110158