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Search: id:A104416
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| A104416 |
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Triangle, read by rows, where T(n,k) = A008275(k+1,n-k+1) are Stirling numbers of the first kind. |
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+0
2
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| 1, -1, 1, 0, -3, 1, 0, 2, -6, 1, 0, 0, 11, -10, 1, 0, 0, -6, 35, -15, 1, 0, 0, 0, -50, 85, -21, 1, 0, 0, 0, 24, -225, 175, -28, 1, 0, 0, 0, 0, 274, -735, 322, -36, 1, 0, 0, 0, 0, -120, 1624, -1960, 546, -45, 1, 0, 0, 0, 0, 0, -1764, 6769, -4536, 870, -55, 1, 0, 0, 0, 0, 0, 720, -13132, 22449, -9450, 1320, -66, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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The matrix inverse forms A104417, in which column 0 equals A082161.
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FORMULA
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G.f.: A(x, y) = Sum_{n>=0} x^n*y^n*Product(k=1..n+1} (1-k*x).
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EXAMPLE
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A(x,y) = (1-x) + x*y*(1-x)*(1-2*x) + x^2*y^2*(1-x)*(1-2*x)*(1-3*x) +
x^3*y^3*(1-x)*(1-2*x)*(1-3*x)*(1-4*x) + ...
Rows begin:
1;
-1,1;
0,-3,1;
0,2,-6,1;
0,0,11,-10,1;
0,0,-6,35,-15,1;
0,0,0,-50,85,-21,1;
0,0,0,24,-225,175,-28,1;
0,0,0,0,274,-735,322,-36,1;
0,0,0,0,-120,1624,-1960,546,-45,1; ...
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PROGRAM
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(PARI) {T(n, k)=local(X=x+x*O(x^n), Y=y+y*O(y^k)); polcoeff(polcoeff(sum(i=0, n, X^i*Y^i*prod(j=1, i+1, 1-j*X)), n, x), k, y)}
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CROSSREFS
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Cf. A104417, A082161.
Sequence in context: A002726 A119734 A073200 this_sequence A144108 A163972 A068464
Adjacent sequences: A104413 A104414 A104415 this_sequence A104417 A104418 A104419
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KEYWORD
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sign,tabl
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 06 2005
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