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Search: id:A045631
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A045631 Number of 2n-bead black-white reversible complementable strings with n black beads and fundamental period 2n. +0
1
1, 1, 2, 6, 20, 70, 243, 889, 3276, 12276, 46435, 176869, 677022, 2602197, 10033212, 38787495, 150286400, 583434322, 2268848988, 8836447021, 34461894010, 134564992002, 526025788992, 2058359779051, 8061905110548, 31602659997975 (list; graph; listen)
OFFSET

0,3
FORMULA

Moebius transform of A045723 (Christian Bower).

CROSSREFS

Sequence in context: A148478 A148479 A150124 this_sequence A135413 A147748 A150125

Adjacent sequences: A045628 A045629 A045630 this_sequence A045632 A045633 A045634

KEYWORD

nonn

AUTHOR

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

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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