19266

Appears in sequences

• Number of points of L1 norm 4 in cubic lattice Z^n.at n=13A035598
• Coordination sequence for 13-dimensional cubic lattice.at n=4A035708
• Coordination sequence for C_13 lattice.at n=2A035750
• Number of partitions satisfying cn(2,5) <= cn(1,5) + cn(4,5) and cn(3,5) <= cn(1,5) + cn(4,5).at n=37A039891
• Number of nodes in virtual, "optimal", chordal graphs of diameter 4 and degree n+1.at n=23A067956
• Triangle T, read by rows, that satisfies matrix equation: T - (T-I)^2 = C, where C is Pascal's triangle.at n=22A117269
• Coordination sequence for 12-dimensional cyclotomic lattice Z[zeta_26].at n=4A126919
• Triangle T(n,k) with the coefficient [x^k] of the series (1-x)^(n+1)* sum_{m=0..infinity} [(3*m+1)^n + (3*m+2)^n]*x^m in row n, column k.at n=22A154646
• Triangle T(n,k) with the coefficient [x^k] of the series (1-x)^(n+1)* sum_{m=0..infinity} [(3*m+1)^n + (3*m+2)^n]*x^m in row n, column k.at n=26A154646
• a(n) = 13*n*(n+1).at n=38A173307
• Coordination sequence for (3,3,4) tiling of hyperbolic plane.at n=25A265071
• Irregular triangle read by rows: T(n,k) = number of k-sided polygons formed when connecting infinite lines between all vertices and all points that divide the sides of an equilateral triangle into n equal parts, for k = 3, 4, ..., max_k.at n=38A346446
• Number of vertices formed when n equally spaced points are placed around a circle and all pairs of points are joined by an interior arc whose radius equals the circle's radius.at n=25A371254
• a(n) = (1/(2*n+1)) * Sum_{k=0..n} k^3 * (2*k+1) * binomial(3*n-k,n-k).at n=6A390972