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A152450
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a(0)=a(1)=1, a(2)=4, a(3)=7, a(n+4) = 10*a(n+2) - a(n).
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0
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1, 1, 4, 7, 39, 69, 386, 683, 3821, 6761, 37824, 66927, 374419, 662509, 3706366, 6558163, 36689241, 64919121, 363186044, 642633047, 3595171199, 6361411349, 35588525946, 62971480443, 352290088261, 623353393081, 3487312356664
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OFFSET
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0,3
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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