598218

Appears in sequences

• Hyper-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=19A193396
• Number of permutations of [n] avoiding {4231, 2143, 1342}.at n=15A294701