4629963

Appears in sequences

• a(n+2) = 3*a(n) - a(n-2) with a(0) = 1, a(1) = 3, a(2) = 6.at n=25A018186
• Expansion of (1-x^2)/(1-3*x-x^2).at n=13A052906
• Fixed-j dispersion for Q = 13: array D(g,h) (g, h >= 1), read by ascending antidiagonals.at n=42A120862