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A172565
Number of 3*n X n 0..1 arrays with row sums 7 and column sums 21
1
0, 0, 0, 0, 0, 0, 1, 369398958888960000, 2343976695927269878444049332219968000, 27470008383944006158001488120005460494368265540960000000, 960689698603154580472955204587017348140176811923434228399447157783872000000
OFFSET
1,8
LINKS
CROSSREFS
Sequence in context: A239923 A104838 A376261 * A360140 A172546 A374949
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2010
STATUS
approved