OFFSET
1,1
LINKS
Toufik Mansour, Jose Luis Ramirez, Enumration of Fuss-skew paths, Ann. Math. Inform. 55 (2022) 125-136, table 2, l=3.
MAPLE
FussSkewP := proc(l, n)
local a, j, k ;
a := 0 ;
for j from 0 to n do
a := a+sum( binomial(n, j) *binomial(j, k) *binomial(n*(l-1), n-2*j+k-1)
* 2^(n*(l-2)+2*j-k+1)*3^(k-1)*(3*(n-j)+k), k=0..j) ;
end do:
a/n ;
end proc:
seq(FussSkewP(3, n), n=1..40) ;
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Mar 31 2023
STATUS
approved