Create 1_1_2n.py

Author: keshavsingh3197

pattern/1_1_2n.py

@@ -0,0 +1,34 @@
+n=int(input("enter no of rows: "))
+i=1
+sum=1
+k=0
+while i<=n:
+ j=i
+ if i%2==0:
+  sum=sum+i-1
+  k=sum
+ else:
+  sum=k+1
+ while j>0:
+  print(sum,' ',sep='',end="")
+  if i%2==0:
+    sum-=1
+  else:
+    sum+=1
+  j-=1
+ print()
+ i+=1
+'''
+output:
+enter no of rows: 10
+1 
+3 2 
+4 5 6 
+10 9 8 7 
+11 12 13 14 15 
+21 20 19 18 17 16 
+22 23 24 25 26 27 28 
+36 35 34 33 32 31 30 29 
+37 38 39 40 41 42 43 44 45 
+55 54 53 52 51 50 49 48 47 46
+'''