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A136441
Number of rotational symmetries in the binary expansion of a number with 0 appended to the front.
2
2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
OFFSET
0,1
EXAMPLE
a(0) = 2 because 00 has two rotational symmetries; a(21) = 3 because 010101 has 3 rotational symmetries.
CROSSREFS
Cf. A138904.
Sequence in context: A025450 A139128 A106752 * A030561 A202053 A334184
KEYWORD
base,easy,nonn
AUTHOR
Max Sills, Apr 03 2008
STATUS
approved