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A097993 Related to A097871. 1
1, 5, 120, 8831, 1248696, 275064055 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
In A097871, for each k, decide where the first k in row k will be and where the first k in column k will be. Suppose this partial matrix is K. Sequence gives the number of such K's.
LINKS
Table of n, a(n) for n=1..6.
CROSSREFS
Cf. A097871.
Sequence in context: A308363 A192639 A099123 * A172806 A054752 A258978
Adjacent sequences: A097990 A097991 A097992 * A097994 A097995 A097996
KEYWORD
nonn
AUTHOR
Guenter Stertenbrink (Sterten(AT)aol.com), Sep 08 2004
STATUS
approved

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Last modified June 8 22:55 EDT 2024. Contains 373227 sequences. (Running on oeis4.)