23974

Appears in sequences

• a(n) = floor(n*(n^3-n-3)/(2*(n-1))).at n=34A117561
• Triangle read by rows: T(n,k) is the number of nondecreasing Dyck paths of semilength n and having k double rises at an odd level (n >= 1, k >= 0).at n=51A121529
• Floor of sum of the first n^2 square roots.at n=33A138357
• Permanent of the n-th principal submatrix of A204551.at n=5A204552
• Indices of the prime factors of Fermat numbers in the sequence of primes.at n=7A343557
• a(n) = number of partitions p of n such that the greatest multiplicity of the parts of p is a part of p.at n=43A365613