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Search: id:A137495
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| 2, 3, 4, 7, 13, 23, 40, 70, 123, 216, 379, 665, 1167, 2048
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OFFSET
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0,1
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COMMENT
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From 3(both),identical to its second differences.
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FORMULA
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a(n)=3a(n-2)-a(n-3)+2a(n-4).From recurrences family a(n)=k*a(n-1)+(3-2k)*a(n-2)+(k-1)*a(n-3)+(2-k)*a(n-4).The best is a(n)=2a(n-1)-a(n-2)+a(n-3).For every difference.
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CROSSREFS
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Cf. A005314.
Sequence in context: A022437 A057983 A096723 this_sequence A099779 A000690 A049876
Adjacent sequences: A137492 A137493 A137494 this_sequence A137496 A137497 A137498
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KEYWORD
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nonn,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Apr 27 2008
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