58768

Appears in sequences

• Number of Catalan objects fixed by four-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees).at n=12A079225
• Sum of the elements in the coprime subsets of the integers 1 to n.at n=18A087081
• Expansion of phi(-q^9) / phi(-q) in powers of q where phi() is a Ramanujan theta function.at n=28A128770
• a(n) = A129150(n) / 4, where A129150(n) = n-th arithmetic derivative of 2^3.at n=13A129284
• a(n) = A129151(n) / 27.at n=12A129285
• Least k > 0 such that gcd(k^n+4, (k+1)^n+4) > 1, or 0 if there is no such k.at n=43A255854
• Expansion of phi(q^9) / phi(q) in powers of q where phi() is a Ramanujan theta function.at n=28A261988
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 461", based on the 5-celled von Neumann neighborhood.at n=7A272292