78880

Appears in sequences

• Number of n X 3 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.at n=6A221478
• T(n,k)=Number of nXk arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.at n=42A221483
• Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.at n=2A221489
• Triangle read by rows: T(n,k) = number of connected matchings with n crossings and k chords, in a disk, k=2..n+1.at n=72A232223
• a(n) = 4*n*(n^2 - 3*n - 1)/3.at n=40A275876
• Triangle of Touchard's chord enumerating polynomial coefficients [x^k] P_n(x).at n=59A322456
• a(n) = least positive integer m such that when m*(m+1) is written in base n, it does not contain the digits 0 or n-1 and contains every single digit from 1 to n-2 exactly once, or 0 if no such number exists.at n=9A382055