20920706406
domain: N
Appears in sequences
- Pisot sequences E(2,6), L(2,6), P(2,6), T(2,6).at n=21A008776
- a(0)=1; a(n) = 2*3^(n-1) for n >= 1.at n=22A025192
- a(n) = Sum_{k=0..m} (k+1) * A026148(n, m-k), where m=0 for n=1; m=n+1 for n >= 2.at n=21A027334
- Expansion of (1+2*x+6*x^2)/(1-9*x^3).at n=32A076738
- Binomial transform of a Jacobsthal trisection.at n=11A092810
- Expansion of (1+3*x)/(1-3*x).at n=21A099856
- a(1) = 3, a(n+1) = 2*(3^n).at n=21A110593
- Denominator of Euler(n,1/3).at n=21A156180
- Number of (n+1) X 2 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.at n=19A206143
- a(n) = n^9*(11*n+9)/2.at n=9A229152
- Number of ascending runs in {1,...,9}^n.at n=10A229283