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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; 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.

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 (njas(AT)research.att.com).

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.