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A128808 Coefficients of the invariant of degree 20 associated with the icosahedral grooup. 1
-1, 228, -494, -228, -1 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

A. Erdelyi, Higher Transcendental Functions, McGraw-Hill, 1955, Vol. 3, p. 11.

F. Klein, Lectures on the Icosahedron ..., 2nd Rev. Ed., 1913; reprinted by Dover, NY, 1956; see p. 61.

S. Mukai, An Introduction to Invariants and Moduli, Cambridge, 2003; see p. 19.

EXAMPLE

H = - (x^20+y^20) + 228*(x^15*y^5-x^5*y^15) - 494*x^10*y^10.

CROSSREFS

Cf. A128809. The third invariant (which does not have its own entry) is f = x*y*(x^10+11*x^5*y^5-y^10).

Sequence in context: A190027 A090943 A154519 * A043411 A172531 A206005

Adjacent sequences:  A128805 A128806 A128807 * A128809 A128810 A128811

KEYWORD

sign,fini,full

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Apr 10 2007

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.