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A045628 Number of 2n-bead black-white reversible necklaces with n black beads and fundamental period 2n. +0
1
1, 1, 1, 2, 6, 15, 46, 132, 432, 1384, 4735, 16158, 56766, 200473, 718012, 2587000, 9398080, 34324173, 126067124, 465093570, 1723171550, 6407924165, 23910560070, 89494164972, 335913861648, 1264107416450, 4768452532025 (list; graph; listen)
OFFSET

0,4
LINKS

Index entries for sequences related to bracelets

FORMULA

Moebius transform of A005648 (Christian Bower).

CROSSREFS

Sequence in context: A052870 A001444 A138574 this_sequence A127383 A047870 A027287

Adjacent sequences: A045625 A045626 A045627 this_sequence A045629 A045630 A045631

KEYWORD

nonn

AUTHOR

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

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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