

A296916


List of coefficients of reduced chromatic polynomial of icosahedron, highest order terms first.


2




OFFSET

1,2


COMMENTS

These are the coefficients when the chromatic polynomial of the icosahedron (see A296917) is divided by x*(x1)*(x2)*(x3).


REFERENCES

N. Biggs, Algebraic Graph Theory, 2nd ed. Cambridge University Press, 1993. See p. 69.


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

The reduced chromatic polynomial is x^824*x^7+260*x^61670*x^5+6999*x^419698*x^3+36408*x^240240*x+20170.
Multiplying by x*(x1)*(x2)*(x3) and expanding we get the chromatic polynomial for the icosahedron, which is x^12  30*x^11 + 415*x^10  3500*x^9 + 20023*x^8  81622*x^7 + 241605*x^6  517360*x^5 + 780286*x^4  782108*x^3 + 463310*x^2  121020*x.


CROSSREFS

Cf. A296917, A218514.
Sequence in context: A296575 A009175 A308054 * A187380 A000145 A286346
Adjacent sequences: A296913 A296914 A296915 * A296917 A296918 A296919


KEYWORD

sign,fini,full


AUTHOR

N. J. A. Sloane, Dec 22 2017


STATUS

approved



