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A259707
Irregular triangle read by rows: T(n,k) = number of permutations of n elements which have k overlaps.
1
1, 2, 4, 2, 10, 12, 2, 24, 48, 34, 12, 2, 66, 196, 230, 144, 70, 12, 2
OFFSET
2,2
REFERENCES
A. Sade, Sur les Chevauchements des Permutations, published by the author, Marseille, 1949.
LINKS
Albert Sade, Sur les Chevauchements des Permutations, published by the author, Marseille, 1949. [Annotated scanned copy]
EXAMPLE
Triangle begins:
1,
2,
4,2,
10,12,2,
24,48,34,12,2,
66,196,230,144,70,12,2,
...
CROSSREFS
Cf. A259706.
Sequence in context: A118920 A305260 A162982 * A335866 A247085 A320971
KEYWORD
nonn,tabf,more
AUTHOR
N. J. A. Sloane, Jul 05 2015
STATUS
approved