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A122959
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a(0)=1, a(n)=(-1)^n*(2-2^(n-1)) for n>0.
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0
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1, -1, 0, 2, -6, 14, -30, 62, -126, 254, -510, 1022, -2046, 4094, -8190, 16382, -32766, 65534, -131070, 262142, -524286, 1048574, -2097170, 4194302, -8388606, 16777214, -33554430, 67108862, -134217726, 268435454
(list; graph; refs; listen; history; internal format)
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