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A027561
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Number of 4-unbalanced strings of length n (=2^n-A027559[ n ]).
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0
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0, 0, 0, 0, 0, 2, 6, 22, 56, 152, 356, 858, 1914, 4334, 9372, 20440, 43280, 92114, 192182, 402246, 830328, 1717496, 3517668, 7214218, 14689994, 29938526, 60697148, 123127224, 248807472, 502963778, 1013829414, 2044098166
(list; graph; refs; listen; history; internal format)
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