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A015492
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a(0)=1, a(1)=6, a(n) = sum_{k=0}^{k=n-1} 6^k a(k).
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0
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1, 6, 37, 1369, 297073, 385303681, 2996506727137, 139808014368031009, 39137436118143496566433, 65735903040447825272422496161, 662466512863011927404416372294221217, 40056817423347655955546590948840276184277409
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OFFSET
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0,2
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LINKS
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FORMULA
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PROG
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(Magma) I:=[1, 6, 37]; [n le 3 select I[n] else (6^(n-2)+1)*Self(n-1): n in [1..15]]; // Vincenzo Librandi, Nov 11 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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