125489

Appears in sequences

• Number of compositions of n with either all parts odd or all parts even.at n=25A097896
• Antidiagonal sums of the convolution array A213505.at n=12A213547
• a(1) = greatest k such that H(k) - H(4) < 1/3 + 1/4; a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(4); and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.at n=25A224868
• Number of partitions of [n] such that the number of blocks of size k is zero or a divisor of k for every k.at n=11A374319