28418

Appears in sequences

• Restricted permutations.at n=14A000382
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 14.at n=15A031602
• Numbers k that divide 6^k + 4^k.at n=36A045591
• Triangle read by rows: T(n,k) is the number of nondecreasing Dyck paths of semilength n and having k double rises at an even level (n >= 1, k >= 0). A nondecreasing Dyck path is a Dyck path for which the sequence of the altitudes of the valleys is nondecreasing.at n=45A121531
• Central terms of pendular trinomial triangle A122445.at n=10A122447
• Number of 2 X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.at n=12A228661
• Numbers k such that (3^ord(3, k) - 1)/k is prime, where ord(3, k) is the multiplicative order of 3 (mod k).at n=29A297363
• Expansion of e.g.f. Sum_{k>=1} (-1)^(k + 1) * log(1 + x)^k / (k * (1 - log(1 + x)^k)).at n=6A330388
• Numbers k such that the ring of integers of Q(2^(1/k)) is not Z[2^(1/k)].at n=33A342390