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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 22 00:42 EDT 2020. Contains 337276 sequences. (Running on oeis4.)