Table 2: Maximum bounds with different and a = 0.9 (Example 4.2).

Methods 2 4 6 8 10 15 Song and Wang [12] 11 11 12 13 14 17 Zhang et al. [13] 11 12 13 14 16 19 Song et al. [14] 15 16 17 18 19 22 Wu et al. [16] 16 18 18 20 20 22 Theorem 3.1 18 18 19 20 20 23 Theorem 3.4 18 18 19 20 21 23