28880

Appears in sequences

• Number of walks on square lattice.at n=15A005565
• Expansion of (theta_3(z)*theta_3(19z) + theta_2(z)*theta_2(19z))^4.at n=35A028644
• Octahedral torus number: a(n) = n^2 + 2*(Sum_{k=1..n-1} k^2) - 2*(floor((n+1)/2)^2 + 2*(Sum_{k=1..floor((n+1)/2)-1} k^2)) + (1 - (-1)^n)/2.at n=38A050442
• a(n) is the cototient of n^3.at n=37A053192
• Invariant number of internal vertices of n-circum-C_5 H_5 systems.at n=9A122679
• Wiener index of the prism graph Y_n on 2n nodes.at n=37A138179
• a(n) = 289*n^2 - 2*n.at n=9A158252
• Triangle read by rows. T(n, k) = 2 * Eulerian(n, k - 1) - binomial(n - 1, k - 1)* binomial(n, k - 1) / k.at n=38A174159
• Triangle read by rows. T(n, k) = 2 * Eulerian(n, k - 1) - binomial(n - 1, k - 1)* binomial(n, k - 1) / k.at n=42A174159
• Floor-Sqrt transform of Riordan numbers (A005043).at n=24A192671
• a(n) = 20*n^2.at n=38A195322
• A010062(2^n-1).at n=12A228952
• Alternating sum of octagonal pyramidal numbers.at n=38A269429
• Numbers k such that 22*10^k + 7 is prime.at n=31A271646
• Numbers n such that A083722(n) > 1 and A083722(n) occurs later in A083722.at n=19A293893