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A083331
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(3*5^n-2*4^n+3^n)/2.
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1
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1, 5, 26, 137, 722, 3785, 19706, 101897, 523682, 2677385, 13629386, 69136457, 349699442, 1764742985, 8889229466, 44709799817, 224608392002, 1127293880585, 5653520131946, 28335932715977, 141953379225362, 710862920970185
(list; graph; refs; listen; history; internal format)
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