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A054751 Number of inequivalent n X n matrices over GF(4) under action of dihedral group of the square D_4. 1
1, 4, 55, 34960, 537157696, 140738033618944, 590295811483987148800, 39614081257168338331296071680, 42535295865117309120430975675097153536, 730750818665451459102461990840694008379514814464 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

1/8*(4^(n^2)+2*4^(n^2/4)+3*4^(n^2/2)+2*4^((n^2+n)/2)) if n is even and 1/8*(4^(n^2)+2*4^((n^2+3)/4)+4^((n^2+1)/2)+4*4^((n^2+n)/2)) if n is odd.

CROSSREFS

Cf. A054247.

Sequence in context: A206384 A099122 A001500 * A189873 A143650 A143649

Adjacent sequences:  A054748 A054749 A054750 * A054752 A054753 A054754

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), May 15 2000

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Last modified February 17 15:44 EST 2012. Contains 206050 sequences.