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A135925
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G.f.: (x^2+x-1)*(1+2*x+S)*(1-5*x+2*x^2+(3*x-1)*S)^2*(-1+3*x+2*x^2+(1-x)*S), where S=sqrt(1-4*x).
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1
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0, 0, 0, 0, 0, 0, -16, 0, 80, 240, 656, 1936, 6000, 19088, 61792, 202832, 673888, 2263392, 7677712, 26280800, 90709616, 315486768, 1104982560, 3895248720, 13813470240, 49256281920, 176536299168, 635710344672, 2299280127328, 8350257302304, 30441306959040
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,7
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REFERENCES
| C. K. Fan, Structure of a Hecke algebra quotient, J. Amer. Math. Soc., 10 (1997), 139-167. [See D(y) on p. 158.]
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MAPLE
| S:=sqrt(1-4*y); Dy:=(y^2+y-1)*(1+2*y+S)*(1-5*y+2*y^2+(3*y-1)*S)^2*(-1+3*y+2*y^2+(1-y)*S);
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CROSSREFS
| Cf. A135926.
Sequence in context: A005077 A059060 A059681 * A188784 A123935 A169764
Adjacent sequences: A135922 A135923 A135924 * A135926 A135927 A135928
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 09 2008
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