30368

Appears in sequences

• Number of connected trivalent graphs with 2n nodes and girth exactly 7.at n=16A006927
• Number of trivalent connected simple graphs with 2n nodes and girth at least 7.at n=16A014375
• 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 87.at n=37A031585
• Numerators of continued fraction convergents to sqrt(478).at n=8A041912
• Numbers m such that phi(m) = tau(m)^3.at n=17A068559
• a(n) = (p-1)! mod p^2 where p = n-th prime.at n=42A112660
• Irregular triangle C(n,k): the number of connected k-regular graphs on n vertices having girth at least seven.at n=97A186717
• Number of connected regular simple graphs on n vertices with girth exactly 7.at n=32A186747
• Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.at n=8A208974
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 531", based on the 5-celled von Neumann neighborhood.at n=31A272752
• Length of shortest prefix of the Kolakoski sequence K (A000002) containing all blocks of length n that appear in K.at n=44A283511
• Number of enriched p-trees of weight 2n + 1 in which all outdegrees and all leaves are odd.at n=9A300652