750120

Appears in sequences

• "CHK" (necklace, identity, unlabeled) transform of 1, 2, 3, 4, ...at n=16A032170
• Inverse EULER transform of A064831 (with its initial 1 omitted).at n=17A072337
• Numbers that can be expressed as the difference of the squares of primes in exactly thirteen distinct ways.at n=4A092009
• Triangle T(n,k) = number of forests of labeled rooted trees of height at most 1, with n labels, k of which are used for root nodes and any root may contain >= 1 labels, n >= 0, 0<=k<=n.at n=51A143396
• a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^2, where Lucas(n) = A000204(n).at n=16A203853
• Number of forests of labeled rooted trees of height at most 1, with n labels, six of which are used for root nodes and any root may contain >= 1 labels.at n=3A273656
• a(n) = A324484(n)/n.at n=16A324485