525456

Appears in sequences

• a(0) = 0, a(1) = a(2) = a(3) = 1; thereafter, a(n) = a(n-1) + a(n-2) + a(n-4).at n=26A005251
• Pisot sequences E(4,7), P(4,7).at n=21A010901
• a(0) = 0, a(1) = 1, a(2) = 1; thereafter a(n) = 5*a(n-1) - 4*a(n-2) + a(n-3).at n=13A012855
• Pisot sequences E(7,9), P(7,9).at n=40A020720
• Expansion of (1 - x)/(1 - 3*x + 2*x^2 - x^3).at n=16A052921
• a(n) = Sum_{d|n} d*2^(n/d - 1).at n=20A054599
• Number of n-th generation triangles in the tiling of the hyperbolic plane by triangles with angles {Pi/2, Pi/3, 0}.at n=43A096231
• Padovan numbers for which the multiplicative digital root is also a Padovan number.at n=36A117600
• Padovan numbers which can be divided by their digital root.at n=31A117602
• Even Padovan numbers.at n=23A134720
• Expansion of 1/(1-x^2-x^3).at n=50A182097
• Row sums of the triangular matrix A190088.at n=8A190089
• Unmatched value maps: number of n X 2 binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 n X 2 array.at n=12A218836
• The number of all possible covers of L-length line segment by 2-length line segments with allowed gaps < 2.at n=48A228361
• Dirichlet g.f.: Product_{k>=2} (1 + k^(-s))^(2^(k-1)).at n=19A344265