Table 1 The numerical results for \(\pmb{t=0.25}\)

\(h^{0}-ex\)

2.331e − 2

6.077e − 3

1.573e − 3

3.854e − 4

9.643e − 5

2.411e − 5

\(r_{n}^{(0)}\)

2^1.9395

2^1.9833

2^1.9957

2^1.9989

2^1.9997

\(h^{2}-ex\)

3.329e − 4

2.363e − 5

1.533e − 6

9.696e − 8

6.065e − 9

\(r_{n}^{(1)}\)

2^3.8163

2^3.9463

2^3.9859

2^3.9964

\(h^{4}-ex\)

3.014e − 6

5.972e − 8

1.004e − 9

1.597e − 11

\(r_{n}^{(2)}\)

2^5.6571

2^5.8942

2^5.9745

\(h^{6}-ex\)

1.284e − 8

7.213e − 11

2.800e − 13