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A045627 Number of 2n-bead black-white reversible strings with n black beads and fundamental period 2n. +0
1
1, 1, 3, 9, 34, 125, 459, 1715, 6432, 24300, 92375, 352715, 1352034, 5200299, 20058297, 77558625, 300540160, 1166803109, 4537567188, 17672631899, 68923264250, 269128935495, 1052049481857, 4116715363799, 16123801834656 (list; graph; listen)
OFFSET

0,3
FORMULA

Moebius transform of A032123(n+1) (Christian Bower).

CROSSREFS

Adjacent sequences: A045624 A045625 A045626 this_sequence A045628 A045629 A045630

Sequence in context: A138769 A100076 A053791 this_sequence A007722 A137953 A085686

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

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