26518

Appears in sequences

• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 1.at n=40A050043
• Number of imprimitive (periodic) bracelets (or necklaces) with n red or blue beads such that the beads switch colors when bracelet is turned over.at n=39A115121
• Numbers k such that k^2 + 1 == 0 (mod 41^2).at n=31A157116
• Number of compositions (ordered partitions) of n into pentagonal pyramidal numbers (A002411).at n=43A322853
• The number of vertices on a Reuleaux triangle formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.at n=9A340644
• Number of integer partitions of n where the parts do not have the same median as the distinct parts.at n=39A360244