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Search: id:A130215
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| A130215 |
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Order of modular group of degree 7^(n-1)+1. |
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+0
1
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| 0, 168, 58800, 20176632, 6920642400, 2373780746568, 814206798896400, 279272932041230232, 95790615690280324800, 32856181181767119892968, 11269670145346128902694000, 3865496859853722261079883832
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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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
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a(n) = (7^(n-1))*(7^(2n-2)-1)/2.
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MATHEMATICA
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Table[7^(x - 1) (7^(2 x - 2) - 1)/2, {x, 1, 15}]
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CROSSREFS
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Cf. A120689.
Adjacent sequences: A130212 A130213 A130214 this_sequence A130216 A130217 A130218
Sequence in context: A035827 A075920 A076006 this_sequence A008699 A003797 A003929
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Aug 04 2007
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