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A006109 Gaussian binomial coefficient [ n,n/2 ] for q=4.
(Formerly M3917)
0
1, 1, 5, 21, 357, 5797, 376805, 24208613, 6221613541, 1594283908581, 1634141006295525, 1673768626404966885, 6857430062381149327845 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

J. Goldman and G.-C. Rota, The number of subspaces of a vector space, pp. 75-83 of W. T. Tutte, editor, Recent Progress in Combinatorics. Academic Press, NY, 1969.

I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p, 99.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A141798 A015461 A101694 * A009732 A009758 A143503

Adjacent sequences:  A006106 A006107 A006108 * A006110 A006111 A006112

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 25 16:31 EDT 2013. Contains 225647 sequences.