A259707 Irregular triangle read by rows: T(n,k) = number of permutations of n elements which have k overlaps.

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

Table of n, a(n) for n=2..20.

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

Adjacent sequences: A259704 A259705 A259706 * A259708 A259709 A259710

Keyword

nonn,tabf,more

Author

N. J. A. Sloane, Jul 05 2015

Status

approved