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A027711
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Number of binary sequences of length n with an even number of ones, at least two of the ones being contiguous.
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0
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0, 1, 2, 4, 9, 21, 47, 101, 212, 440, 907, 1859, 3791, 7699, 15586, 31476, 63445, 127689, 256671, 515433, 1034248, 2073968, 4156791, 8327911, 16679007, 33395527, 66851750, 133801708, 267762321, 535781757, 1071979535
(list; graph; refs; listen; history; internal format)
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