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A155132
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a(n)=8*a(n-1)+8*a(n-2), n>2 ; a(0)=1, a(1)=7, a(2)=63 .
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1
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1, 7, 63, 560, 4984, 44352, 394688, 3512320, 31256064, 278147072, 2475225088, 22026977280, 196017618944, 1744356769792, 15522995109888, 138138815037440, 1229294481178624, 10939466369728512, 97350086807257088
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