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A130214
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Order of modular group of degree 5^(n-1)+1.
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0
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0, 60, 7800, 976500, 122070000, 15258787500, 1907348625000, 238418579062500, 29802322387500000, 3725290298460937500, 465661287307734375000, 58207660913467382812500, 7275957614183425781250000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| E. Mathieu, Memoire sur la nombre de valeurs que peut acquirer une fonction quand on y permut ses variables de toutes les maniers possibles, Journ. de math. (2) 5 (1860), 9-42 (see p. 39).
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FORMULA
| a(n) = 5^(n - 1) (5^(2 n - 2) - 1)/2.
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MATHEMATICA
| Table[5^(x - 1) (5^(2 x - 2) - 1)/2, {x, 1, 15}]
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CROSSREFS
| Cf. A120689.
Sequence in context: A091032 A178785 A091753 * A146498 A003750 A001525
Adjacent sequences: A130211 A130212 A130213 * A130215 A130216 A130217
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Aug 04 2007
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