18964

Appears in sequences

• Least m such that if r and s in {1/1, 1/3, 1/6,..., 1/C(n+1,2)} satisfy r < s, then r < k/m < s for some integer k.at n=45A024826
• Number of 6-ary rooted trees with n nodes and height at most 4.at n=19A036621
• The (7^n)-th composite number.at n=5A065606
• Centered 21-gonal numbers.at n=42A069178
• Number of Dyck paths such that the sum of the peak-abscissae is n.at n=50A129528
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 0), (1, -1, 0), (1, 0, 0), (1, 1, -1)}.at n=9A148741
• Those terms of A255571 whose every A080541/A080542-rotation is also a term of A255571.at n=32A258001
• G.f. satisfies: A(x,y) = 1 + x*y*A(x,y+1)^2.at n=23A268652
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n)^2, where a(0) = 2, a(1) = 4, b(0) = 1, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=13A296249