265719

Appears in sequences

• a(n) = (3^n - 3)/2.at n=11A029858
• a(n) = 3*(a(n-2) + 1), with a(0) = 1, a(1) = 3.at n=21A087503
• Expansion of (1+3x)/((1-x^2)(1-3x^2)).at n=21A094025
• a(0) = 1, a(1) = 3, a(n) = 3*a(n-1) + 3 for n > 1.at n=11A123109
• Rectangular array read by rows: T(n,k) is the number of words of length n on alphabet {0,1,2} that have exactly k records, n>=0, 0<=k<=3.at n=50A285852