OFFSET
2,4
LINKS
Alois P. Heinz, Rows n = 2..23, flattened
Per Alexandersson and Frether Getachew, An involution on derangements, arXiv:2105.08455 [math.CO], 2021.
Yanni Pei and Jiang Zeng, Counting signed derangements with right-to-left minima and excedances, arXiv:2206.11236 [math.CO], 2022.
FORMULA
Sum_{k=1..n-1} k * T(n,k) = A344455(n). - Alois P. Heinz, May 19 2021
EXAMPLE
1;
1, 1;
3, 5, 1;
11, 21, 11, 1;
53, 113, 79, 19, 1;
309, 715, 589, 211, 29, 1;
2119, 5235, 4835, 2141, 461, 41, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Michel Marcus, May 19 2021
EXTENSIONS
More terms (rows 9-11) from Alois P. Heinz, May 19 2021
STATUS
approved