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Search: id:A077952
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| A077952 |
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Expansion of 1/(1-x+x^2+2*x^3). |
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+0
2
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| 1, 1, 0, -3, -5, -2, 9, 21, 16, -23, -81, -90, 37, 289, 432, 69, -941, -1874, -1071, 2685, 7504, 6961, -5913, -27882, -35891, 3817, 95472, 163437, 60331, -294050, -681255, -507867, 761488, 2631865, 2886111, -1268730, -9418571, -13922063, -1966032, 30793173, 60603331, 33742222, -88447455
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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Row sums of Riordan array (1,x(1-x-2x^2)). - Paul Barry (pbarry(AT)wit.ie), Mar 09 2006
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FORMULA
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a(n)=sum{k=0..n, sum{j=0..n, C(k,j-k)C(k,n-j)(-2)^(n-j)}} - Paul Barry (pbarry(AT)wit.ie), Mar 09 2006
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CROSSREFS
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Sequence in context: A057033 A003574 A101157 this_sequence A077975 A112323 A102507
Adjacent sequences: A077949 A077950 A077951 this_sequence A077953 A077954 A077955
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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