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Search: id:A105847
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| 1, 0, 1, 1, -1, 1, 0, 3, -2, 1, 2, -3, 6, -3, 1, 0, 9, -10, 10, -4, 1, 5, -9, 26, -22, 15, -5, 1, 0, 29, -42, 59, -40, 21, -6, 1, 14, -29, 108, -121, 115, -65, 28, -7, 1, 0, 99, -174, 308, -276, 202, -98, 36, -8, 1, 42, -99, 450, -620, 734, -546, 329, -140, 45, -9, 1, 0, 351, -726, 1547, -1700, 1540, -980, 506, -192, 55, -10, 1, 132
(list; table; graph; listen)
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OFFSET
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0,8
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COMMENT
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Product of Riordan array (1/(1+x),x/(1+x)) (inverse binomial matrix) and A105632. Rows sums are A007477.
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FORMULA
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Column k has g.f. (sum{j=0..k-1, C(k-1, j)C(j)x^(2j)/(1-4x^2)^(j+1/2)}+0^k*(1-sqrt(1-4x^2))/(2x^2))(x/(1+x))^k
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EXAMPLE
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Triangle begins
1;
0,1;
1,-1,1;
0,3,-2,1;
2,-3,6,-3,1;
0,9,-10,10,-4,1;
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CROSSREFS
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Adjacent sequences: A105844 A105845 A105846 this_sequence A105848 A105849 A105850
Sequence in context: A047878 A120441 A136560 this_sequence A048984 A136531 A127318
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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 22 2005
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