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Search: id:A109962
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| 1, -1, 1, 4, -5, 1, -22, 30, -9, 1, 140, -200, 72, -13, 1, -969, 1425, -570, 130, -17, 1, 7084, -10626, 4554, -1196, 204, -21, 1, -53820, 81900, -36855, 10647, -2142, 294, -25, 1, 420732, -647280, 302064, -93496, 21080, -3472, 400, -29, 1, -3362260, 5217300, -2504304, 816816, -200277, 37485, -5250, 522
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Riordan array (g,f) where f/(1-f)^4=x and g=1/(1-f). First column is (-1)^n*A002293(n). Diagonal sums are A109963.
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FORMULA
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Number triangle T(n, k)=(-1)^(n-k)*((4k+1)/(3n+k+1))*binomial(4n, n-k)
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EXAMPLE
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Rows begin
1;
-1,1;
4,-5,1;
-22,30,-9,1;
140,-200,72,-13,1;
-969,1425,-570,130,-17,1;
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CROSSREFS
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Sequence in context: A068447 A082051 A108446 this_sequence A102230 A147724 A110519
Adjacent sequences: A109959 A109960 A109961 this_sequence A109963 A109964 A109965
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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), Jul 06 2005
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