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A045625 Number of n-bead black-white reversible strings with fundamental period n. 7
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..32.

FORMULA

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

CROSSREFS

Column 2 of A284871.

Sequence in context: A275778 A007839 A184345 * A294501 A146004 A001933

Adjacent sequences:  A045622 A045623 A045624 * A045626 A045627 A045628

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified March 19 00:13 EDT 2019. Contains 321306 sequences. (Running on oeis4.)