41951

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= n/3.at n=18A047196
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-1)/3.at n=18A048008
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n+1)/3.at n=18A048041
• Frobenius number of the numerical semigroup generated by four consecutive tetrahedral numbers.at n=15A069761
• Numbers such that the digital sums in bases 2, 3, 5 and 7 all are equal.at n=34A135127
• E.g.f. satisfies A(x) = 1 + (exp(x*A(x)^2) - 1)/A(x).at n=6A367180