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Search: id:A107587
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| A107587 |
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Expansion of (sqrt(1-2x+5x^2)-sqrt(1-2x-3x^2))/(4x^2). |
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+0
1
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| 1, 1, 1, 1, 3, 11, 31, 71, 155, 379, 1051, 2971, 8053, 21165, 56057, 152881, 425491, 1186227, 3287971, 9102787, 25346457, 71111377, 200425149, 565676629, 1597672277, 4520632981, 12827046181, 36493762501, 104027787451
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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Binomial transform of 1,0,0,0,2,0,0,0,4,.... (see A048990).
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FORMULA
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a(n)=sum{k=0..floor(n/2), binomial(n, 2k)C(k)mod(k+1, 2)} where C(n) is A000108.
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CROSSREFS
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Adjacent sequences: A107584 A107585 A107586 this_sequence A107588 A107589 A107590
Sequence in context: A071568 A093406 A097081 this_sequence A087323 A034543 A054343
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), May 16 2005
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