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A259707 Irregular triangle read by rows: T(n,k) = number of permutations of n elements which have k overlaps. 1

%I #9 Aug 04 2015 13:58:43

%S 1,2,4,2,10,12,2,24,48,34,12,2,66,196,230,144,70,12,2

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

%D A. Sade, Sur les Chevauchements des Permutations, published by the author, Marseille, 1949.

%H Albert Sade, <a href="/A000108/a000108_17.pdf">Sur les Chevauchements des Permutations</a>, published by the author, Marseille, 1949. [Annotated scanned copy]

%e Triangle begins:

%e 1,

%e 2,

%e 4,2,

%e 10,12,2,

%e 24,48,34,12,2,

%e 66,196,230,144,70,12,2,

%e ...

%Y Cf. A259706.

%K nonn,tabf,more

%O 2,2

%A _N. J. A. Sloane_, Jul 05 2015

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)