27812

Appears in sequences

• Number of plane regions after drawing (in general position) a convex n-gon and all its diagonals.at n=28A027927
• Super-4 Numbers (4 * n^4 contains substring '4444' in its decimal expansion).at n=28A032744
• Numbers k with property that sum of divisors of k-th triangular number is some m-th triangular number.at n=16A175849
• Hyper-Wiener index of a benzenoid consisting of a spiral chain of n hexagons (s=1; see the Gutman et al. reference).at n=10A193392
• Number of (n+1) X (1+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=3A235205
• Number of (n+1) X (4+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=0A235208
• T(n,k) is the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=6A235212
• T(n,k) is the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=9A235212
• a(n) = [x^n] G(n-1,x) where G(n,x) is the n-th iteration of G(1,x) = x/(1-x+x^2), so that G(n,x) = G(n-1, G(1,x)) with G(0,x)=x.at n=8A242573
• Expansion of Product_{k>=1} 1/(1-x^(k+4))^k.at n=36A263360
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 181", based on the 5-celled von Neumann neighborhood.at n=33A270628
• Numbers k for which rank of the elliptic curve y^2=x^3-k*x is 4.at n=20A309034
• Numbers that are the sum of seven fourth powers in seven or more ways.at n=26A345573
• Numbers that are the sum of seven fourth powers in exactly seven ways.at n=17A345829