19496

Appears in sequences

• 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 69.at n=38A031567
• Number of factorizations with 3 levels of parentheses indexed by prime signatures. A050340(A025487).at n=30A050341
• Sum of the levels of all nodes in all noncrossing trees with n edges.at n=5A062236
• Ulam's spiral (NNE spoke).at n=35A143861
• a(1) = 2, a(n) = (n-th-even n^3) - (sum of previous terms).at n=29A181509
• (A192533)/2.at n=30A192534
• Number of nonnegative integer arrays of length n+2 with new values 0 upwards introduced in order, and containing the value n-1.at n=18A211562
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 579", based on the 5-celled von Neumann neighborhood.at n=27A273028
• Numbers k such that the k-th composition in standard order is an alternating permutation of {1..k} for some k.at n=36A349051