199854

Appears in sequences

• a(n) is the number of complement pairs of primitive 2n-bead balanced binary necklaces.at n=13A383904
• a(n) is the number of complement pairs of 2n-bead balanced bicolor necklaces.at n=13A386388
• a(n) is the number of complement pairs of imprimitive (periodic) 2n-bead balanced binary necklaces.at n=26A387130