627760

Appears in sequences

• Generalized Fibonacci numbers: a(n) = a(n-1) + 9*a(n-2).at n=11A015445
• T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nXk array.at n=31A220959
• Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 4Xn array.at n=4A220961
• Expansion of 1/(1 - x/(1 - 9*x^3)^(2/3)).at n=18A373544