Hyperfactorial
The function defined by
where
is the K-Function and the first few values for 
, 2, ... are 1, 4, 108, 27648, 86400000,4031078400000, 3319766398771200000, ... (Sloane's A002109), and these numbers are called hyperfactorials by Sloane andPlouffe (1995).See also G-Function, Glaisher-Kinkelin Constant, K-Function
References
Sloane, N. J. A. SequenceA002109/M3706in ``An On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.
- Isobaric Polynomial
- Isochronous Curve
- Isoclinal
- Isocline
- Isoclinic Groups
- Isodynamic Points
- Isoenergetic Nondegeneracy
- Isogonal Conjugate
- Isogonal Line
- Isogonic Centers
- Isograph
- Isohedral Tiling
- Isohedron
- Isolated Point
- Isolated Singularity
- Isolating Integral
- Isometric Latitude
- Isometry
- Isomorphic Graphs
- Isomorphic Groups
- Isomorphic Posets
- Isomorphism
- Isoperimetric Inequality
- Isoperimetric Point
- Isoperimetric Problem