71650

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 4.at n=15A049947
• First of three consecutive Ulam numbers (A002858) in arithmetic progression with difference 22.at n=32A068856
• a(n) = floor(lcm(1,2,...n)/(1+2+...+n)).at n=17A109922
• Number of nondecreasing -2..2 vectors of length n whose dot product with some nonincreasing -2..2 vector equals n.at n=41A226393
• a(n) = (n/2) * (n^3 - 2*n^2 - 2*n + 5).at n=20A242983