Gives the binomial coefficient from continuing Pascal's triangle returning 0 for negative integer k
PascalBinomial[n, m]
PascalBinomial[10, 3]
→ 120Plot[PascalBinomial[x, 3], {x, -2, 4}]
→ -Graphics-Plot[PascalBinomial[3, x], {x, -2, 4}]
→ -Graphics-