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A130213
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Order of modular group of degree 3^(n-1)+1.
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0
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0, 12, 360, 9828, 265680, 7174332, 193709880, 5230175508, 141214764960, 3812798732652, 102945566017800, 2779530283189188, 75047317648233840, 2026277576508690972, 54709494565753788120
(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) = 3^(n - 1) (3^(2 n - 2) - 1)/2.
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MATHEMATICA
| Table[3^(x - 1) (3^(2 x - 2) - 1)/2, {x, 1, 15}]
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CROSSREFS
| Cf. A120689.
Sequence in context: A128043 A012431 A012386 * A012633 A009079 A012379
Adjacent sequences: A130210 A130211 A130212 * A130214 A130215 A130216
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Aug 04 2007
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