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A059776
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Three-quadrant Ferrers graphs that partition n.
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2
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1, 2, 5, 11, 24, 48, 95, 178, 328, 585, 1025, 1754, 2958, 4897, 8002, 12889, 20523, 32289, 50296, 77550, 118521, 179553, 269881, 402532, 596178, 876942, 1281777, 1862015, 2689405, 3862891, 5519403, 7846393, 11100970, 15632733, 21917280
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| G. E. Andrews, Three-quadrant Ferrers graphs, Indian J. Math., 42 (No. 1, 2000), 1-7.
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MAPLE
| t1 := add( (-1)^(j)*q^(j*(j+1)/2)*(1-q^(j+1))/(1-q), j=0..101); t3 := mul((1-q^n)^3, n=1..101); series(t1/t3, q, 101);
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CROSSREFS
| Cf. A000041, A001522, A059777.
Sequence in context: A191240 A091358 A091359 * A091360 A090764 A027934
Adjacent sequences: A059773 A059774 A059775 * A059777 A059778 A059779
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 21 2001
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