Divided difference columns :
0.
0.40547
0.55962
0.69315
0.09531
0.81094
0.6166
0.53412
0.66427
- 0.25912
- 0.16496
- 0.20023
0.09416
0.08816
- 0.05996
The interpolated value at 1.3 using p3(x) is :
0.26137
The interpolated value at 1.3 using p4(x) is :
0.26250