22712

Appears in sequences

• Expansion of tan(tan(log(1+x))).at n=7A009689
• Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k - gcd(m,k).at n=31A124141
• Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having two, four, five, six or eight distinct values for every i,j,k<=n.at n=4A211752
• Number of nX7 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=3A241434
• T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=48A241435
• Number of 4Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=6A241438
• Numbers k whose deficiency is 64: 2k - sigma(k) = 64.at n=9A275997
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 165) or the same sequence for the mesh patterns (12, 167), (12, 225), (12, 233), (12, 270), (12, 302), (12, 330), (12, 458).at n=11A289589
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=10A316234