A351363 Number of necklaces with n black and n white beads with at least four consecutive black beads.
0, 0, 0, 1, 5, 21, 84, 327, 1251, 4760, 18018, 68104, 257088, 970480, 3664070, 13842215, 52331695, 198021936, 750027090, 2843686271, 10792866315, 41006110365, 155961264880, 593797895358, 2263126224780, 8634161689920, 32973466762098, 126047166461574, 482298648250416, 1847156083546316
Offset: 1
Keywords
Links
- Marko R. Riedel et al., Necklaces made of black and white beads, Math StackExchange, Feb 2022.