20151

Appears in sequences

• Poincaré series [or Poincare series] of Lie algebra associated with a certain braid group.at n=15A007993
• Fibonacci sequence beginning 1, 12.at n=17A022102
• Wiener index of a benzenoid consisting of a double-step zig-zag chain of n hexagons (n >= 2, s = 2123; see the Gutman et al. reference).at n=13A193395
• Antidiagonal sums of the convolution array A213762.at n=10A213764
• n^3 + 4*n^2 - 5*n + 1.at n=26A241577
• Isolated deficient numbers that are divisible by 3.at n=31A273255