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Table 1 Exponential growth rates of ⟨k, τ⟩-structures. We have k-noncrossing structures with minimum stack-length greater than or equal to three.

From: Sequence-structure relations of pseudoknot RNA

k

3

4

5

6

7

8

9

Ï„ = 3

2.0348

2.2644

2.4432

2.5932

2.7243

2.8414

2.9480

Ï„ = 4

1.7898

1.9370

2.0488

2.1407

2.2198

2.2896

2.3523

Ï„ = 5

1.6465

1.7532

1.8330

1.8979

1.9532

2.0016

2.0449

Ï„ = 6

1.5515

1.6345

1.6960

1.7457

1.7877

1.8243

1.8569

Ï„ = 7

1.4834

1.5510

1.6008

1.6408

1.6745

1.7038

1.7297

Ï„ = 8

1.4319

1.4888

1.5305

1.5639

1.5919

1.6162

1.6376

Ï„ = 9

1.3915

1.4405

1.4763

1.5049

1.5288

1.5494

1.5677