OFFSET
0,8
LINKS
Bashir Ali and A. Umar, Some combinatorial properties of the alternating group, Southeast Asian Bulletin Math. 32 (2008), 823-830.
FORMULA
T(n,k) = C(n,k) * A000387(n-k).
E.g.f.: x^(k+2) * exp(-x) / (2*k!*(1-x)).
EXAMPLE
Triangle starts:
0;
0, 0;
1, 0, 0;
0, 3, 0, 0;
6, 0, 6, 0, 0;
20, 30, 0, 10, 0, 0;
...
MAPLE
A145225 := proc(n, k)
end proc:
seq(seq(A145225(n, k), k=0..n), n=0..12) ; # R. J. Mathar, Jul 06 2023
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Abdullahi Umar, Oct 10 2008
STATUS
approved