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Search: id:A140649
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| A140649 |
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Consider successive South-East diagonals of today 1, 2, 0, 4, 1, 0 triangle (*). 0, 1, 2, 4= A131577 must be preceded with 1, 0 2, 1, 0 4, 2, 1, 0 = a(n).Reversal (essentially) A140531 . |
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| 1, 0, 2, 1, 0, 4, 2, 1, 0, 8, 4, 2, 1, 0, 16, 8, 4, 2, 1, 0, 32, 16, 8, 4, 2, 1, 0, 64, 32, 16, 8, 4, 2, 1, 0
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OFFSET
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0,3
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COMMENT
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(*) Correct sequence for create,without Jacobsthal's help,yesterday 1, 2, 3, 4, 5, 6, 8, 10: rows 4,5 have negative last term, rows 6,7 negative last two terms, rows 8, 9 negative last three terms .. . Examples: 44+48-4= 88 (=2*44) 171+172-1=342 (=2*171). Also by S-E diagonals:negative terms from 1 after 0, 0 . Then for today sequences, two cases:without or with signs - .
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FORMULA
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0, a(n) gives triangle 0; 1, 0; 2, 1, 0; 4, 2, 1, 0; 8, 4, 2, 1, 0; See 1, 2, 1, 4, 2, 1 = A130321(n) . 1; 2, 1; 4, 2, 1; are respectively before 0, A131577(n), from diagonals, of today 1, 2, 0, 4, 1, 0, 8, 2, 0, 1, 16, 4, 1, 0, 2 triangle.
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CROSSREFS
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Sequence in context: A139136 A138002 A062296 this_sequence A091453 A062173 A004558
Adjacent sequences: A140646 A140647 A140648 this_sequence A140650 A140651 A140652
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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 09 2008
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