21272

Appears in sequences

• Numbers k such that phi(sigma(k)+k) = sigma(k-phi(k)), where phi is A000010 and sigma is A000203.at n=34A063710
• Number of fixed n-celled polyzebras (or zebra-move-connected polyominoes).at n=5A093877
• Number of fixed 4-dimensional polycubes with n cells.at n=5A151830
• Number of 3-step knight's tours on an (n+2) X (n+2) board summed over all starting positions.at n=19A186852
• Number A(n,k) of tilings of a k X n rectangle using dominoes and right trominoes; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=60A219987
• Number of tilings of a 5 X n rectangle using dominoes and right trominoes.at n=5A219988
• Number of tilings of an n X n square using dominoes and right trominoes.at n=5A219994
• Numbers of espalier polycubes of a given volume in dimension 4.at n=26A229917
• Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10.at n=2A233959
• Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10.at n=2A233962
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10 (10 maximizes T(1,1)).at n=12A233967
• Number of (4+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.at n=10A250772
• a(n) is the multiplicative inverse of A008514(n+1) modulo A008514(n).at n=14A334137
• Square array read by descending antidiagonals: A(n,k) is the number of fixed n-dimensional polyominoes of size k.at n=39A385291