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A074070 Number of Paley classes of Hadamard matrices of order 4n. 0
2, 3, 2, 3, 2, 3, 2, 4, 1, 2, 1, 4, 1, 2, 2, 4, 1, 2, 1, 3, 2, 1, 0, 4, 1, 2, 2, 2, 0, 2, 1, 5, 1, 1, 1, 2, 1, 2, 0, 3, 2, 3, 0, 1, 2, 0, 0, 5, 1, 2, 1, 2, 1, 2, 1, 3, 2, 0, 0, 3, 2, 1, 2, 5, 0, 2, 0, 2, 1, 1, 1, 2, 0, 1, 1, 2, 1, 1, 1, 3, 0, 2, 1, 3, 1, 1, 2, 1, 0, 3, 1, 1, 0, 0, 1, 6, 1, 1, 1, 2, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Positions of zeros (multiplied by 4) gives A046116.

LINKS

Table of n, a(n) for n=1..102.

Eric Weisstein's World of Mathematics, Hadamard Matrix

CROSSREFS

Cf. A046116.

Sequence in context: A178620 A023524 A068639 * A304097 A251101 A065067

Adjacent sequences:  A074067 A074068 A074069 * A074071 A074072 A074073

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Aug 18 2002

STATUS

approved

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Last modified February 23 00:18 EST 2019. Contains 320411 sequences. (Running on oeis4.)