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A059422 Difference between number of even equivalence classes and odd classes of terms in a symmetric determinant of order n. +0
4
1, 1, 0, -1, -1, 3, -2, 25, -213, 1547, -13276, 129069, -1375775, 16009741, -202184274, 2753591087, -40231298023, 627731583225, -10418193719432, 183264681827863, -3406106373633009, 66695477905719251, -1372395141298236250, 29607108539572186329 (list; graph; listen)
OFFSET

0,6

REFERENCES

L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 260, #12, a'_n.

FORMULA

E.g.f.: exp(1/2*t-1/4*t^2)*(1+t)^(1/2)

CROSSREFS

Cf. A002135.

Sequence in context: A100645 A132960 A009574 this_sequence A102056 A065353 A046272

Adjacent sequences: A059419 A059420 A059421 this_sequence A059423 A059424 A059425

KEYWORD

sign

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Jan 30 2001

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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