28002

Appears in sequences

• Number of Hamiltonian paths in a 5 X n grid starting in the lower left corner and ending in the lower right.at n=9A014585
• a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026659.at n=7A026977
• Integer part of 4th root of product of first n primes.at n=15A127601
• Number of 4-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=33A187378
• Number of n-bead necklaces labeled with numbers 1..6 allowing reversal, with no adjacent beads differing by more than 1.at n=12A208719
• Number of directed Hamiltonian walks from NW to SW corners of a 9 X (2*n+1) grid.at n=2A333605
• Expansion of Sum_{k>=0} x^k/(1 - k^3 * x).at n=6A349880
• a(n) = Sum_{k=0..floor(n/3)} k^(n-3*k).at n=18A352945