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Search: id:A069182
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| A069182 |
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a(1) = 2, a(2) = -32; a(n) = -16*a(n - 1) + 12*add(binomial(2*n - 2, 2*i)*a(i)*a(n - 1 - i), i = 1 .. n - 2). |
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+0
3
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| 2, -32, 800, -35840, 2508800, -246579200, 32614400000, -5594021888000, 1206137913344000, -319343506227200000, 101868334198292480000, -38531929483929190400000, 17052425131124169113600000, -8729129668569923688857600000, 5117793695169522496962560000000
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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E. Dintzl, Ueber die Zahlen im Koerper k(sqrt(-2)), welche den Bernoulli'schen Zahlen analog sind, Sitz. K. Akad. Wiss. Wien, Math.-Naturw. Klasse, 108 (1909), 1-29.
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MAPLE
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A069182 := proc(n) option remember; if n=1 then 2 elif n=2 then -32 else -16*A069182(n-1)+12*add(binomial(2*n-2, 2*i)*A069182(i)*A069182(n-1-i), i=1..n-2); fi; end;
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CROSSREFS
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Sequence in context: A038394 A068110 A009517 this_sequence A012233 A012119 A012198
Adjacent sequences: A069179 A069180 A069181 this_sequence A069183 A069184 A069185
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Apr 13 2002
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