66671
domain: N
Appears in sequences
- a(n) = (n + 1)*(2*n + 1)*(4*n + 9)/3.at n=28A269342
- a(n) = numerator(-1/n + Sum_{k=1..n} 2^(k-1)/k).at n=10A332786
- Number of subsets of {1..n} without a subset summing to n.at n=23A365377
- a(n) is the smallest nonnegative integer k where exactly n solutions to x^2 + 3*x*y + y^2 = k with 0 < x < y.at n=6A374095
- Smallest k such that k can be written in exactly n ways as x^2 + 3*x*y + y^2 with 0 <= x <= y.at n=6A374275
- Numbers k such that k - A224787(k) is a square.at n=29A386623