54075

Appears in sequences

• Numbers k such that k^2 is formed from two subsquares that overlap in a single digit.at n=18A048422
• a(n)=sqrt(A145848(n)).at n=13A146991
• Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0001 pattern in any orientation.at n=10A147238
• Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2.at n=3A221231
• Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2.at n=2A221232
• T(n,k)=Number of nXk arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2.at n=17A221234
• T(n,k)=Number of nXk arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2.at n=18A221234
• Irregular triangle read by rows: T(n,k) is the sum of the widths of the free polyominoes with n cells and width k, n >= 1, 1 <= k <= ceiling(n/2).at n=44A379637