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A118005
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((-1)^n*5^(n+1) + 9^(n+1))/14.
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0
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1, 4, 61, 424, 4441, 36844, 347221, 3046864, 27812401, 248358484, 2244991981, 20156099704, 181649037961, 1633620638524, 14708689262341, 132347685782944, 1191281759937121, 10720772899980964, 96490770797094301
(list; graph; refs; listen; history; internal format)
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