OFFSET
0,3
EXAMPLE
MAPLE
MATHEMATICA
Unprotect[Power]; 0^0 = 1; Protect[Power]; a[m_, n_] := Sum[(-1)^(j+i)*Binomial[i, j]*n^j*k^(m-j) , {i, 0, m}, {j, 0, m}, {k, 0, n}]; Table[a[m-n, n], {m, 0, 10}, {n, 0, m}] // Flatten (* Jean-François Alcover, Jul 26 2013 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Peter Luschny, Nov 02 2011
STATUS
approved