52608

Appears in sequences

• Number of nonisomorphic systems of catafusenes for the unsymmetrical schemes (group C_s) with two appendages (see references for precise definition).at n=8A045445
• Double factorial primes; values k for which k!! + 1 is prime.at n=6A080778
• Triangular array related to Motzkin triangle A026300.at n=43A084536
• Triangle read by rows: T(n,k) = number of lattice paths from (0,0) to (n,k) that do not go below the line y=0 and consist of steps U=(1,1), D=(1,-1) and three types of steps H=(1,0) (left factors of 3-Motzkin steps).at n=37A091965
• Nonisomorphic catacondensed monoheptafusenes (see reference for precise definition).at n=9A121071
• Generalized Riordan array based on the binomial transform of the Fine's numbers A000957.at n=58A187914
• Numbers k such that (10^k - 19)/9 is prime.at n=23A293272
• Number of solutions to 1 +- 3 +- 6 +- ... +- n*(n+1)/2 == 0 mod n.at n=19A300307