1 files changed, 15 insertions, 0 deletions
diff --git a/progs/a311.py b/progs/a311.py
new file mode 100644
index 0000000..aafdf9c
--- /dev/null
+++ b/progs/a311.py
@@ -0,0 +1,15 @@
+def binomial_coeff(n, k): 
+	C = [[0 for j in range(k + 1)] 
+			for i in range(n + 1)] 
+	for i in range(0, n + 1): 
+		for j in range(0, min(i, k) + 1): 
+			if (j == 0 or j == i): 
+				C[i][j] = 1
+			else: 
+				C[i][j] = (C[i - 1][j - 1] 
+							+ C[i - 1][j]) 
+	return C[n][k] 
+def lobb_num(n, m): 
+	return (((2 * m + 1) *
+		binomial_coeff(2 * n, m + n)) 
+					/ (m + n + 1))
+\ No newline at end of file