OFFSET
3,3
COMMENTS
The 120-cell is one of 6 regular convex polytopes in 4 dimensions. The Schläfli symbol of the 120-cell is {5,3,3}.
LINKS
A. Weimholt, 120-cell net
Eric Weisstein's World of Mathematics, 120-Cell
Eric Weisstein's World of Mathematics, Cycle Polynomial
EXAMPLE
a(5) = 720, because there are 720 5-cycles on the graph of the 120-cell.
Cycle polynomial is 720*x^5 + 3600*x^8 + 2400*x^9 + 4320*x^10 + 28800*x^11 + 35400*x^12 + 64800*x^13 + 284400*x^14 + 540000*x^15 + 1139400*x^16 + 3708000*x^17 + 8557200*x^18 + 19677600*x^19 + 55725120*x^20 + 140359200*x^21 + 346456800*x^22 + 935942400*x^23 + ...
CROSSREFS
Cf. A167981 (2n-cycles on graph of the tesseract).
Cf. A167982 (n-cycles on graph of 16-cell).
Cf. A167983 (n-cycles on graph of 24-cell).
Cf. A167985 (n-cycles on graph of 600-cell).
Cf. A085452 (2k-cycles on graph of n-cube).
Cf. A144151 (ignoring first three columns (0<=k<=2), k-cycles on (n-1)-simplex).
Cf. A167986 (k-cycles on graph of n-orthoplex).
Cf. A108997 (number of vertices n-steps from a given vertex on graph of 120-cell).
KEYWORD
fini,more,nonn,hard
AUTHOR
Andrew Weimholt, Nov 16 2009
EXTENSIONS
a(24) from Eric W. Weisstein, Feb 21 2014
a(25) from Eric W. Weisstein, Mar 11 2014
STATUS
approved