2657204

Appears in sequences

• Sequence of sums of alternating powers of 3.at n=25A079362
• Expansion of (1+2x-x^3+x^4)/(1-4x^2+3x^4).at n=26A181655
• a(n) = 5*3^n-1.at n=12A198643
• a(n) = 5*9^n-1.at n=6A198962