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A091759
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0^n+2((n+1)^n-(-1)^n)/(n+2).
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0
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1, 2, 4, 26, 208, 2222, 29412, 466034, 8609344, 181818182, 4322904100, 114308980106, 3328297874640, 105828636433886, 3649115753173828, 135637824071393762, 5406799097296318720, 230095953656704898102
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=P(n, n-2, n) where P(n, m, z)=product{j=0..n-1, z-sum{k=1..m, e^(jk2pi*I/n)}}, I=sqrt(-1)
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CROSSREFS
| Cf. A083063.
Sequence in context: A019019 A032328 A019034 * A193480 A032076 A088888
Adjacent sequences: A091756 A091757 A091758 * A091760 A091761 A091762
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Feb 03 2004
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