A045625 Number of n-bead black-white reversible strings with fundamental period n.

1, 2, 1, 4, 7, 18, 29, 70, 126, 266, 507, 1054, 2037, 4158, 8183, 16488, 32760, 65790, 131026, 262654, 524265, 1049524, 2097119, 4196350, 8388450, 16781292, 33554367, 67116784, 134217657, 268451838, 536870247, 1073774590, 2147483520

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Crossrefs

Column 2 of A284871.

Formula

Moebius transform of A005418(n+1) (Christian Bower).