80388

Appears in sequences

• Number of partitions of n with equal number of parts congruent to each of 1 and 2 (mod 3).at n=54A035536
• Number of partitions of 3n with same number of parts == 1 (mod 3) and == 2 (mod 3).at n=18A035592
• Least common multiple of Lucas numbers L(0), L(1), ..., L(n).at n=7A062954
• Triangle read by rows: T(n,k), n >=1, 0 <= k <= C(n,k), = number of n X n symmetric positive definite matrices with 2's on the main diagonal and 1's and 0's elsewhere and with k 1's above the diagonal.at n=83A080858
• a(n) = Sum_{m=1..n} lcm(s(n,m),S(n,m)), where s(n,m) is an unsigned Stirling number of the first kind and S(n,m) is a Stirling number of the second kind. (a(n) = sum of terms in n-th row of triangle A128264.)at n=6A128265
• Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).at n=6A171258
• Molecular topological indices of the crown graphs.at n=21A192796
• Number of 4-element subsets that can be chosen from {1,2,...,4*n} having element sum 8*n+2.at n=36A204468
• Denominator of Sum_{k=1..n} 1/L(k) where L(n) is the n-th Lucas number (A000204).at n=6A225905
• a(n) is the total number of down steps before the first up step in all 4_2-Dyck paths of length 5*n. A 4_2-Dyck path is a lattice path with steps (1, 4), (1, -1) that starts and ends at y = 0 and stays above the line y = -2.at n=6A334786
• LCM of Lucas numbers {L(1), L(2), ..., L(n)}.at n=6A355322