82904796

Appears in sequences

• a(n) = 3^n * n*(n + 1).at n=12A116138
• a(n) = (n/4)*3^(n/2)*((1+sqrt(3))^2+(-1)^n*(1-sqrt(3))^2).at n=26A187273
• Denominators of mass formula for connected vacuum graphs on n nodes for a phi^4 field theory.at n=26A226259
• Number of defective 3-colorings of a 2 X n 0..2 array connected horizontally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.at n=14A229587
• Expansion of (1+3*x)^2/(1-3*x)^2.at n=13A236967