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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. 7
1, 4, 55, 34960, 537157696, 140738033618944, 590295811483987148800, 39614081257168338331296071680, 42535295865117309120430975675097153536, 730750818665451459102461990840694008379514814464 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

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: A099122 A001500 A246968 * A189873 A329459 A143650

Adjacent sequences:  A054748 A054749 A054750 * A054752 A054753 A054754

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, May 15 2000

STATUS

approved

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Last modified November 22 06:15 EST 2019. Contains 329389 sequences. (Running on oeis4.)