

A323445


Number of lengthn 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
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OFFSET

1,2


LINKS



EXAMPLE

For n=4 the 10 strings are {0000,0010,0100,0101,0110} and their bitwise complements.


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



