137376

Appears in sequences

• Structured octagonal prism numbers.at n=35A100176
• Triangle T(n, k) = 2^(k-1) * E(n, k-1) where E(n,k) are the Eulerian numbers A173018, read by rows.at n=33A142075
• T(n, k) = E(n, k)*2^k where E(n,k) are the Eulerian numbers A173018, for n > 0 and 0 <= k <= n-1, additionally T(0,0) = 1.at n=34A156365
• Numbers with prime factorization pq^4r^5.at n=23A190468
• Partial sums of A267326.at n=37A264390
• a(1) = 1; a(n) = Sum_{d|n, d < n} phi(n/d) * a(d)^2.at n=35A332778
• a(n) = Sum_{k=0..floor(n/3)} 2^k * 3^(n-3*k) * binomial(k,n-3*k)^2.at n=20A387479