18789

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 86 ones.at n=17A031854
• Numbers whose set of base-11 digits is {1,3}.at n=40A032918
• Number of trees with n nodes and 7 leaves.at n=10A055294
• Row sums of triangle A171843.at n=10A171844
• Number of strings of numbers x(i=1..6) in 0..n with sum i*x(i) equal to n*6.at n=11A184706
• Number of arrays of -7..7 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero.at n=4A193709
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,0,4,1,1,1,1 for x=0,1,2,3,4,5,6.at n=6A205074
• Sum of the site-perimeters of all bargraphs of area n.at n=11A274217
• p-INVERT of (1,1,1,1,1,...), where p(S) = 1 - S - S^2 - S^3 - S^4 - S^5.at n=9A291007
• Expansion of Product_{k>=1} 1/(1 - x^(2*k-1))^(k*(k-1)/2).at n=31A294778