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Search: id:A140787
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| A140787 |
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Based on pair reversal of Jacobsthal numbers and successive differences (*).Consider low triangle 1; 0, 1; 2, -1, 4; -2, 3, 0, 4; 6, -5, 8, -4, 16; -10, 11, -8, 12, 0, 16; a(n) is absolute rows sum. |
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+0
1
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OFFSET
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0,3
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COMMENT
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(*) First three are A092808, A094359, A140505.
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FORMULA
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a(n+1)-2a(n)= -1, 5, -5, 21, -21, 85, -85 essentially doubled A001045(2n) signed.Note triangle's rows sum: b(n)= 1, 1, 5, 5, 21, 21 =A052992.Many possibilities between a(n) and b(n).
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CROSSREFS
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Sequence in context: A083203 A082536 A057590 this_sequence A032695 A007449 A067649
Adjacent sequences: A140784 A140785 A140786 this_sequence A140788 A140789 A140790
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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), Jul 14 2008
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