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Search: id:A000320
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| A000320 |
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Generalized tangent numbers.
(Formerly M3722 N1521)
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+0
2
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| 4, 272, 55744, 23750912, 17328937984, 19313964388352, 30527905292468224, 64955605537174126592, 179013508069217017790464
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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D. Shanks, Generalized Euler and class numbers, Math. Comp. 21 (1967), 689-694; 22 (1968), 699.
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FORMULA
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a(n) = right term of M^n * [1 0 0]; where M^n * [1 0 0] = [1 n a(n)], and M = the 3X3 matrix [1 0 0 / 1 1 0 / 1 3 1]. E.g. a(4) = 22 since M^4 * [1 0 0] = [1 4 2]. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 19 2004
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CROSSREFS
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Adjacent sequences: A000317 A000318 A000319 this_sequence A000321 A000322 A000323
Sequence in context: A089667 A119008 A108134 this_sequence A101758 A134786 A074309
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KEYWORD
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nonn
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AUTHOR
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njas
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