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Search: id:A105522
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| 1, -2, 1, 1, -2, 1, 2, 0, -2, 1, -2, 4, -1, -2, 1, -4, -1, 6, -2, -2, 1, 5, -10, 1, 8, -3, -2, 1, 10, 4, -18, 4, 10, -4, -2, 1, -14, 28, 0, -28, 8, 12, -5, -2, 1, -28, -14, 56, -8, -40, 13, 14, -6, -2, 1, 42, -84, -6, 96, -21, -54, 19, 16, -7, -2, 1, 84, 48, -180, 15, 150, -40, -70, 26, 18, -8, -2, 1, -132, 264, 33, -330, 55, 220, -66
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums A105523 have g.f. 1-xc(-x^2) where c(x) is the g.f. of A000108. Diagonal sums are A105524.
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FORMULA
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Riordan array ((1+2x+4x^2-(1+2x)sqrt(1+4x^2))/(2x^2), (sqrt(1+4x^2)-1)/(2x))
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EXAMPLE
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Rows begin {1}, {-2, 1}, {1, -2, 1}, {2, 0, -2, 1}, {-2, 4, -1, -2, 1}, ...
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CROSSREFS
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Adjacent sequences: A105519 A105520 A105521 this_sequence A105523 A105524 A105525
Sequence in context: A053734 A057856 A117939 this_sequence A131774 A078316 A055443
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KEYWORD
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easy,sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Apr 11 2005
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