117040

Appears in sequences

• Numbers k not divisible by 6 such that sigma(k) > 3*k.at n=5A126104
• If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 4-subsets of X containing none of X_i, (i=1,...,n).at n=18A130810
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.at n=11A148455
• a(n) = 81*n^2 + 2*n.at n=37A177099
• Numbers other than prime powers divisible by the sum of the squares of their prime divisors.at n=9A190882
• Molecular topological index of the Andrásfai graphs.at n=18A192790
• Number of -n..n arrays of 4 elements with zero sum and no two neighbors summing to zero.at n=27A199833
• Triangle read by rows giving numbers H(n,k), number of classes of twin-tree-rooted maps with n edges whose root bond contains k edges.at n=51A260040
• Numbers other than prime powers divisible by the sum and the sum of squares of their prime divisors.at n=1A268417
• Denominators of r(n) := Sum_{k=0..n-1} 1/Product_{j=0..4} (k + j + 1), for n >= 0, with r(0) = 0.at n=18A300299