80731

Appears in sequences

• Expansion of (1-x)/(1-x+x^2-2*x^3).at n=44A078015
• Inverse Moebius transform of 5-simplex numbers A000389.at n=22A101289
• A binomial recursion: a(n) = q(n) (see formula).at n=6A135150
• Even-indexed coefficients related to Kirchhoff index of hexagonal (benzene) chains.at n=10A137195
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2.at n=27A211911
• a(n) = binomial(n + 4, n - 1) + 1.at n=23A323228