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A082963 Number of n X n 0-1 matrices with half 1s and half 0s (rounded up/down if odd). 9
1, 1, 2, 23, 1674, 652048, 1134460910, 7900674292378, 229078019084673798, 26549036304190836144544, 12611418068196090318131968752, 23955745839516317585042064530077352 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..11.

James Grime, Maths Problem: Complete Noughts and Crosses (Burnside's Lemma)

FORMULA

a(n) = A054252(n,floor(n^2/2).

CROSSREFS

Cf. A054247, A014409, A019318.

Sequence in context: A079480 A239398 A239811 * A083759 A240563 A067823

Adjacent sequences:  A082960 A082961 A082962 * A082964 A082965 A082966

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, May 27 2003

STATUS

approved

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Last modified November 17 21:02 EST 2018. Contains 317278 sequences. (Running on oeis4.)