18489

Appears in sequences

• Number of immersions of the unoriented circle into the unoriented plane with n double points.at n=7A008983
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 90.at n=38A031588
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 74 ones.at n=21A031842
• a(n) = 2*n^3 - 2*n + 9.at n=20A127989
• a(n) = A168174(n)-10^12.at n=22A168248
• Number of nondecreasing sequences of n 1..7 integers with every element dividing the sequence sum.at n=31A212535
• a(n) = number of new distinct proper angles with vertex and legs on grid points in an n X n square grid that were not found in an (n-1) X (n-1) square grid.at n=30A252592
• Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.at n=11A253154
• Zeroless numbers n such that the products of the decimal digits of n and n^2 coincide.at n=4A257760
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 557", based on the 5-celled von Neumann neighborhood.at n=25A272926
• Triangle read by rows: T(n,k) = number of noncrossing path sets on n nodes up to rotation and reflection with k paths and isolated vertices allowed.at n=59A303868
• Expansion of Product_{k>=0} (1 + x^(3^k) + x^(2*3^k) + x^(3^(k+1)))^(3^k).at n=45A309046
• Number of configurations of the 5 X 3 variant of the sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.at n=14A346737
• Number of length n inversion sequences avoiding the patterns 010 and 110.at n=9A359191
• Number of integer partitions of n such that the maximum is greater than twice the median.at n=36A361857
• a(n) = Sum_{k=1..n} binomial(floor(n/k)+2,3).at n=43A364970