50830

Appears in sequences

• a(n) = (11*n+1)*(11*n+10).at n=20A001536
• a(n) is the number of Dyck paths of semilength n+6 having its first peak at height n+1.at n=16A005557
• a(n) is the number of ways to insert single pairs of parenthesis to completely separate n identical objects in a straight line such that at least one of the objects at the two ends is not enclosed.at n=9A157418
• a(n) = A165966(n)/12.at n=30A166119
• Numbers k such that (7*10^(2*k+1) - 9*10^k - 7)/9 is prime.at n=10A183181
• The Wiener index of the zig-zag polyhex nanotube TUHC_6[2n,2] defined pictorially in Fig. 1 of the Eliasi et al. reference.at n=21A227703
• Rectangular array A read by upward antidiagonals in which the entry A(n,k) in row k and column n gives the number of families of symmetric radially generated monohedral tilings of the disk (each tiling contains 2*(2*n+1)*k congruent tiles), k >= 1, n >= 1.at n=8A273090
• Number of monohedral disk tilings of type C^t_{2n+1,2}.at n=2A296359
• Maximum number of induced copies of the claw graph K_{1,3} in an n-node graph.at n=40A352666