21523359
domain: N
Appears in sequences
- a(n) = (3^n - 3)/2.at n=15A029858
- a(n) = 3*(a(n-2) + 1), with a(0) = 1, a(1) = 3.at n=29A087503
- Expansion of (1+3x)/((1-x^2)(1-3x^2)).at n=29A094025
- a(0) = 1, a(1) = 3, a(n) = 3*a(n-1) + 3 for n > 1.at n=15A123109
- Period of the sequence of the digital roots of Fibonacci n-step numbers.at n=14A210456
- a(n) is the numerator of the ratio of winning probabilities in a game similar to A370823, but with a draw and single round odds A:B:draw of 3:2:1.at n=14A370825