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A323445 Number of length-n binary strings where some nonempty proper prefix is the reverse of a cyclic shift (conjugate) of a suffix. 1
0, 2, 4, 10, 20, 44, 88, 182, 364, 740, 1484, 2990, 5992, 12030, 24092, 48278, 96628, 193458, 387052, 774486, 1549220, 3099106, 6198632, 12398466, 24797384, 49596654, 99193464, 198389538, 396777716, 793557898, 1587108968, 3174217032, 6348411948, 12696809070 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
For n=4 the 10 strings are {0000,0010,0100,0101,0110} and their bitwise complements.
CROSSREFS
Not the same as A094536.
Sequence in context: A238439 A121880 A094536 * A307768 A370583 A297183
KEYWORD
nonn
AUTHOR
Jeffrey Shallit, Jan 15 2019
EXTENSIONS
a(21)-a(34) from Lars Blomberg, Feb 14 2019
STATUS
approved

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Last modified June 15 22:50 EDT 2024. Contains 373412 sequences. (Running on oeis4.)